1 /*******************************************************************************
2 * This file contains main functions related to the iSCSI Target Core Driver.
4 * (c) Copyright 2007-2013 Datera, Inc.
6 * Author: Nicholas A. Bellinger <nab@linux-iscsi.org>
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 ******************************************************************************/
19 #include <crypto/hash.h>
20 #include <linux/string.h>
21 #include <linux/kthread.h>
22 #include <linux/completion.h>
23 #include <linux/module.h>
24 #include <linux/vmalloc.h>
25 #include <linux/idr.h>
26 #include <asm/unaligned.h>
27 #include <scsi/scsi_proto.h>
28 #include <scsi/iscsi_proto.h>
29 #include <scsi/scsi_tcq.h>
30 #include <target/target_core_base.h>
31 #include <target/target_core_fabric.h>
33 #include <target/iscsi/iscsi_target_core.h>
34 #include "iscsi_target_parameters.h"
35 #include "iscsi_target_seq_pdu_list.h"
36 #include "iscsi_target_datain_values.h"
37 #include "iscsi_target_erl0.h"
38 #include "iscsi_target_erl1.h"
39 #include "iscsi_target_erl2.h"
40 #include "iscsi_target_login.h"
41 #include "iscsi_target_tmr.h"
42 #include "iscsi_target_tpg.h"
43 #include "iscsi_target_util.h"
44 #include "iscsi_target.h"
45 #include "iscsi_target_device.h"
46 #include <target/iscsi/iscsi_target_stat.h>
48 #include <target/iscsi/iscsi_transport.h>
50 static LIST_HEAD(g_tiqn_list);
51 static LIST_HEAD(g_np_list);
52 static DEFINE_SPINLOCK(tiqn_lock);
53 static DEFINE_MUTEX(np_lock);
55 static struct idr tiqn_idr;
57 struct mutex auth_id_lock;
58 spinlock_t sess_idr_lock;
60 struct iscsit_global *iscsit_global;
62 struct kmem_cache *lio_qr_cache;
63 struct kmem_cache *lio_dr_cache;
64 struct kmem_cache *lio_ooo_cache;
65 struct kmem_cache *lio_r2t_cache;
67 static int iscsit_handle_immediate_data(struct iscsi_cmd *,
68 struct iscsi_scsi_req *, u32);
70 struct iscsi_tiqn *iscsit_get_tiqn_for_login(unsigned char *buf)
72 struct iscsi_tiqn *tiqn = NULL;
74 spin_lock(&tiqn_lock);
75 list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
76 if (!strcmp(tiqn->tiqn, buf)) {
78 spin_lock(&tiqn->tiqn_state_lock);
79 if (tiqn->tiqn_state == TIQN_STATE_ACTIVE) {
80 tiqn->tiqn_access_count++;
81 spin_unlock(&tiqn->tiqn_state_lock);
82 spin_unlock(&tiqn_lock);
85 spin_unlock(&tiqn->tiqn_state_lock);
88 spin_unlock(&tiqn_lock);
93 static int iscsit_set_tiqn_shutdown(struct iscsi_tiqn *tiqn)
95 spin_lock(&tiqn->tiqn_state_lock);
96 if (tiqn->tiqn_state == TIQN_STATE_ACTIVE) {
97 tiqn->tiqn_state = TIQN_STATE_SHUTDOWN;
98 spin_unlock(&tiqn->tiqn_state_lock);
101 spin_unlock(&tiqn->tiqn_state_lock);
106 void iscsit_put_tiqn_for_login(struct iscsi_tiqn *tiqn)
108 spin_lock(&tiqn->tiqn_state_lock);
109 tiqn->tiqn_access_count--;
110 spin_unlock(&tiqn->tiqn_state_lock);
114 * Note that IQN formatting is expected to be done in userspace, and
115 * no explict IQN format checks are done here.
117 struct iscsi_tiqn *iscsit_add_tiqn(unsigned char *buf)
119 struct iscsi_tiqn *tiqn = NULL;
122 if (strlen(buf) >= ISCSI_IQN_LEN) {
123 pr_err("Target IQN exceeds %d bytes\n",
125 return ERR_PTR(-EINVAL);
128 tiqn = kzalloc(sizeof(struct iscsi_tiqn), GFP_KERNEL);
130 pr_err("Unable to allocate struct iscsi_tiqn\n");
131 return ERR_PTR(-ENOMEM);
134 sprintf(tiqn->tiqn, "%s", buf);
135 INIT_LIST_HEAD(&tiqn->tiqn_list);
136 INIT_LIST_HEAD(&tiqn->tiqn_tpg_list);
137 spin_lock_init(&tiqn->tiqn_state_lock);
138 spin_lock_init(&tiqn->tiqn_tpg_lock);
139 spin_lock_init(&tiqn->sess_err_stats.lock);
140 spin_lock_init(&tiqn->login_stats.lock);
141 spin_lock_init(&tiqn->logout_stats.lock);
143 tiqn->tiqn_state = TIQN_STATE_ACTIVE;
145 idr_preload(GFP_KERNEL);
146 spin_lock(&tiqn_lock);
148 ret = idr_alloc(&tiqn_idr, NULL, 0, 0, GFP_NOWAIT);
150 pr_err("idr_alloc() failed for tiqn->tiqn_index\n");
151 spin_unlock(&tiqn_lock);
156 tiqn->tiqn_index = ret;
157 list_add_tail(&tiqn->tiqn_list, &g_tiqn_list);
159 spin_unlock(&tiqn_lock);
162 pr_debug("CORE[0] - Added iSCSI Target IQN: %s\n", tiqn->tiqn);
168 static void iscsit_wait_for_tiqn(struct iscsi_tiqn *tiqn)
171 * Wait for accesses to said struct iscsi_tiqn to end.
173 spin_lock(&tiqn->tiqn_state_lock);
174 while (tiqn->tiqn_access_count != 0) {
175 spin_unlock(&tiqn->tiqn_state_lock);
177 spin_lock(&tiqn->tiqn_state_lock);
179 spin_unlock(&tiqn->tiqn_state_lock);
182 void iscsit_del_tiqn(struct iscsi_tiqn *tiqn)
185 * iscsit_set_tiqn_shutdown sets tiqn->tiqn_state = TIQN_STATE_SHUTDOWN
186 * while holding tiqn->tiqn_state_lock. This means that all subsequent
187 * attempts to access this struct iscsi_tiqn will fail from both transport
188 * fabric and control code paths.
190 if (iscsit_set_tiqn_shutdown(tiqn) < 0) {
191 pr_err("iscsit_set_tiqn_shutdown() failed\n");
195 iscsit_wait_for_tiqn(tiqn);
197 spin_lock(&tiqn_lock);
198 list_del(&tiqn->tiqn_list);
199 idr_remove(&tiqn_idr, tiqn->tiqn_index);
200 spin_unlock(&tiqn_lock);
202 pr_debug("CORE[0] - Deleted iSCSI Target IQN: %s\n",
207 int iscsit_access_np(struct iscsi_np *np, struct iscsi_portal_group *tpg)
211 * Determine if the network portal is accepting storage traffic.
213 spin_lock_bh(&np->np_thread_lock);
214 if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
215 spin_unlock_bh(&np->np_thread_lock);
218 spin_unlock_bh(&np->np_thread_lock);
220 * Determine if the portal group is accepting storage traffic.
222 spin_lock_bh(&tpg->tpg_state_lock);
223 if (tpg->tpg_state != TPG_STATE_ACTIVE) {
224 spin_unlock_bh(&tpg->tpg_state_lock);
227 spin_unlock_bh(&tpg->tpg_state_lock);
230 * Here we serialize access across the TIQN+TPG Tuple.
232 ret = down_interruptible(&tpg->np_login_sem);
236 spin_lock_bh(&tpg->tpg_state_lock);
237 if (tpg->tpg_state != TPG_STATE_ACTIVE) {
238 spin_unlock_bh(&tpg->tpg_state_lock);
239 up(&tpg->np_login_sem);
242 spin_unlock_bh(&tpg->tpg_state_lock);
247 void iscsit_login_kref_put(struct kref *kref)
249 struct iscsi_tpg_np *tpg_np = container_of(kref,
250 struct iscsi_tpg_np, tpg_np_kref);
252 complete(&tpg_np->tpg_np_comp);
255 int iscsit_deaccess_np(struct iscsi_np *np, struct iscsi_portal_group *tpg,
256 struct iscsi_tpg_np *tpg_np)
258 struct iscsi_tiqn *tiqn = tpg->tpg_tiqn;
260 up(&tpg->np_login_sem);
263 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put);
266 iscsit_put_tiqn_for_login(tiqn);
271 bool iscsit_check_np_match(
272 struct sockaddr_storage *sockaddr,
274 int network_transport)
276 struct sockaddr_in *sock_in, *sock_in_e;
277 struct sockaddr_in6 *sock_in6, *sock_in6_e;
278 bool ip_match = false;
281 if (sockaddr->ss_family == AF_INET6) {
282 sock_in6 = (struct sockaddr_in6 *)sockaddr;
283 sock_in6_e = (struct sockaddr_in6 *)&np->np_sockaddr;
285 if (!memcmp(&sock_in6->sin6_addr.in6_u,
286 &sock_in6_e->sin6_addr.in6_u,
287 sizeof(struct in6_addr)))
290 port = ntohs(sock_in6->sin6_port);
291 port_e = ntohs(sock_in6_e->sin6_port);
293 sock_in = (struct sockaddr_in *)sockaddr;
294 sock_in_e = (struct sockaddr_in *)&np->np_sockaddr;
296 if (sock_in->sin_addr.s_addr == sock_in_e->sin_addr.s_addr)
299 port = ntohs(sock_in->sin_port);
300 port_e = ntohs(sock_in_e->sin_port);
303 if (ip_match && (port_e == port) &&
304 (np->np_network_transport == network_transport))
311 * Called with mutex np_lock held
313 static struct iscsi_np *iscsit_get_np(
314 struct sockaddr_storage *sockaddr,
315 int network_transport)
320 list_for_each_entry(np, &g_np_list, np_list) {
321 spin_lock_bh(&np->np_thread_lock);
322 if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
323 spin_unlock_bh(&np->np_thread_lock);
327 match = iscsit_check_np_match(sockaddr, np, network_transport);
330 * Increment the np_exports reference count now to
331 * prevent iscsit_del_np() below from being called
332 * while iscsi_tpg_add_network_portal() is called.
335 spin_unlock_bh(&np->np_thread_lock);
338 spin_unlock_bh(&np->np_thread_lock);
344 struct iscsi_np *iscsit_add_np(
345 struct sockaddr_storage *sockaddr,
346 int network_transport)
351 mutex_lock(&np_lock);
354 * Locate the existing struct iscsi_np if already active..
356 np = iscsit_get_np(sockaddr, network_transport);
358 mutex_unlock(&np_lock);
362 np = kzalloc(sizeof(struct iscsi_np), GFP_KERNEL);
364 pr_err("Unable to allocate memory for struct iscsi_np\n");
365 mutex_unlock(&np_lock);
366 return ERR_PTR(-ENOMEM);
369 np->np_flags |= NPF_IP_NETWORK;
370 np->np_network_transport = network_transport;
371 spin_lock_init(&np->np_thread_lock);
372 init_completion(&np->np_restart_comp);
373 INIT_LIST_HEAD(&np->np_list);
375 ret = iscsi_target_setup_login_socket(np, sockaddr);
378 mutex_unlock(&np_lock);
382 np->np_thread = kthread_run(iscsi_target_login_thread, np, "iscsi_np");
383 if (IS_ERR(np->np_thread)) {
384 pr_err("Unable to create kthread: iscsi_np\n");
385 ret = PTR_ERR(np->np_thread);
387 mutex_unlock(&np_lock);
391 * Increment the np_exports reference count now to prevent
392 * iscsit_del_np() below from being run while a new call to
393 * iscsi_tpg_add_network_portal() for a matching iscsi_np is
394 * active. We don't need to hold np->np_thread_lock at this
395 * point because iscsi_np has not been added to g_np_list yet.
398 np->np_thread_state = ISCSI_NP_THREAD_ACTIVE;
400 list_add_tail(&np->np_list, &g_np_list);
401 mutex_unlock(&np_lock);
403 pr_debug("CORE[0] - Added Network Portal: %pISpc on %s\n",
404 &np->np_sockaddr, np->np_transport->name);
409 int iscsit_reset_np_thread(
411 struct iscsi_tpg_np *tpg_np,
412 struct iscsi_portal_group *tpg,
415 spin_lock_bh(&np->np_thread_lock);
416 if (np->np_thread_state == ISCSI_NP_THREAD_INACTIVE) {
417 spin_unlock_bh(&np->np_thread_lock);
420 np->np_thread_state = ISCSI_NP_THREAD_RESET;
423 spin_unlock_bh(&np->np_thread_lock);
424 send_sig(SIGINT, np->np_thread, 1);
425 wait_for_completion(&np->np_restart_comp);
426 spin_lock_bh(&np->np_thread_lock);
428 spin_unlock_bh(&np->np_thread_lock);
430 if (tpg_np && shutdown) {
431 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put);
433 wait_for_completion(&tpg_np->tpg_np_comp);
439 static void iscsit_free_np(struct iscsi_np *np)
442 sock_release(np->np_socket);
445 int iscsit_del_np(struct iscsi_np *np)
447 spin_lock_bh(&np->np_thread_lock);
449 if (np->np_exports) {
451 spin_unlock_bh(&np->np_thread_lock);
454 np->np_thread_state = ISCSI_NP_THREAD_SHUTDOWN;
455 spin_unlock_bh(&np->np_thread_lock);
459 * We need to send the signal to wakeup Linux/Net
460 * which may be sleeping in sock_accept()..
462 send_sig(SIGINT, np->np_thread, 1);
463 kthread_stop(np->np_thread);
464 np->np_thread = NULL;
467 np->np_transport->iscsit_free_np(np);
469 mutex_lock(&np_lock);
470 list_del(&np->np_list);
471 mutex_unlock(&np_lock);
473 pr_debug("CORE[0] - Removed Network Portal: %pISpc on %s\n",
474 &np->np_sockaddr, np->np_transport->name);
476 iscsit_put_transport(np->np_transport);
481 static void iscsit_get_rx_pdu(struct iscsi_conn *);
483 int iscsit_queue_rsp(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
485 iscsit_add_cmd_to_response_queue(cmd, cmd->conn, cmd->i_state);
488 EXPORT_SYMBOL(iscsit_queue_rsp);
490 void iscsit_aborted_task(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
492 bool scsi_cmd = (cmd->iscsi_opcode == ISCSI_OP_SCSI_CMD);
494 spin_lock_bh(&conn->cmd_lock);
495 if (!list_empty(&cmd->i_conn_node))
496 list_del_init(&cmd->i_conn_node);
497 spin_unlock_bh(&conn->cmd_lock);
499 __iscsit_free_cmd(cmd, scsi_cmd, true);
501 EXPORT_SYMBOL(iscsit_aborted_task);
503 static void iscsit_do_crypto_hash_buf(struct ahash_request *, const void *,
504 u32, u32, u8 *, u8 *);
505 static void iscsit_tx_thread_wait_for_tcp(struct iscsi_conn *);
508 iscsit_xmit_nondatain_pdu(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
509 const void *data_buf, u32 data_buf_len)
511 struct iscsi_hdr *hdr = (struct iscsi_hdr *)cmd->pdu;
513 u32 niov = 0, tx_size = ISCSI_HDR_LEN;
516 iov = &cmd->iov_misc[0];
517 iov[niov].iov_base = cmd->pdu;
518 iov[niov++].iov_len = ISCSI_HDR_LEN;
520 if (conn->conn_ops->HeaderDigest) {
521 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
523 iscsit_do_crypto_hash_buf(conn->conn_tx_hash, hdr,
524 ISCSI_HDR_LEN, 0, NULL,
525 (u8 *)header_digest);
527 iov[0].iov_len += ISCSI_CRC_LEN;
528 tx_size += ISCSI_CRC_LEN;
529 pr_debug("Attaching CRC32C HeaderDigest"
530 " to opcode 0x%x 0x%08x\n",
531 hdr->opcode, *header_digest);
535 u32 padding = ((-data_buf_len) & 3);
537 iov[niov].iov_base = (void *)data_buf;
538 iov[niov++].iov_len = data_buf_len;
539 tx_size += data_buf_len;
542 iov[niov].iov_base = &cmd->pad_bytes;
543 iov[niov++].iov_len = padding;
545 pr_debug("Attaching %u additional"
546 " padding bytes.\n", padding);
549 if (conn->conn_ops->DataDigest) {
550 iscsit_do_crypto_hash_buf(conn->conn_tx_hash,
551 data_buf, data_buf_len,
553 (u8 *)&cmd->pad_bytes,
554 (u8 *)&cmd->data_crc);
556 iov[niov].iov_base = &cmd->data_crc;
557 iov[niov++].iov_len = ISCSI_CRC_LEN;
558 tx_size += ISCSI_CRC_LEN;
559 pr_debug("Attached DataDigest for %u"
560 " bytes opcode 0x%x, CRC 0x%08x\n",
561 data_buf_len, hdr->opcode, cmd->data_crc);
565 cmd->iov_misc_count = niov;
566 cmd->tx_size = tx_size;
568 ret = iscsit_send_tx_data(cmd, conn, 1);
570 iscsit_tx_thread_wait_for_tcp(conn);
577 static int iscsit_map_iovec(struct iscsi_cmd *, struct kvec *, u32, u32);
578 static void iscsit_unmap_iovec(struct iscsi_cmd *);
579 static u32 iscsit_do_crypto_hash_sg(struct ahash_request *, struct iscsi_cmd *,
580 u32, u32, u32, u8 *);
582 iscsit_xmit_datain_pdu(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
583 const struct iscsi_datain *datain)
586 u32 iov_count = 0, tx_size = 0;
589 iov = &cmd->iov_data[0];
590 iov[iov_count].iov_base = cmd->pdu;
591 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
592 tx_size += ISCSI_HDR_LEN;
594 if (conn->conn_ops->HeaderDigest) {
595 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
597 iscsit_do_crypto_hash_buf(conn->conn_tx_hash, cmd->pdu,
598 ISCSI_HDR_LEN, 0, NULL,
599 (u8 *)header_digest);
601 iov[0].iov_len += ISCSI_CRC_LEN;
602 tx_size += ISCSI_CRC_LEN;
604 pr_debug("Attaching CRC32 HeaderDigest for DataIN PDU 0x%08x\n",
608 iov_ret = iscsit_map_iovec(cmd, &cmd->iov_data[1],
609 datain->offset, datain->length);
613 iov_count += iov_ret;
614 tx_size += datain->length;
616 cmd->padding = ((-datain->length) & 3);
618 iov[iov_count].iov_base = cmd->pad_bytes;
619 iov[iov_count++].iov_len = cmd->padding;
620 tx_size += cmd->padding;
622 pr_debug("Attaching %u padding bytes\n", cmd->padding);
625 if (conn->conn_ops->DataDigest) {
626 cmd->data_crc = iscsit_do_crypto_hash_sg(conn->conn_tx_hash,
632 iov[iov_count].iov_base = &cmd->data_crc;
633 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
634 tx_size += ISCSI_CRC_LEN;
636 pr_debug("Attached CRC32C DataDigest %d bytes, crc 0x%08x\n",
637 datain->length + cmd->padding, cmd->data_crc);
640 cmd->iov_data_count = iov_count;
641 cmd->tx_size = tx_size;
643 ret = iscsit_fe_sendpage_sg(cmd, conn);
645 iscsit_unmap_iovec(cmd);
648 iscsit_tx_thread_wait_for_tcp(conn);
655 static int iscsit_xmit_pdu(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
656 struct iscsi_datain_req *dr, const void *buf,
660 return iscsit_xmit_datain_pdu(conn, cmd, buf);
662 return iscsit_xmit_nondatain_pdu(conn, cmd, buf, buf_len);
665 static enum target_prot_op iscsit_get_sup_prot_ops(struct iscsi_conn *conn)
667 return TARGET_PROT_NORMAL;
670 static struct iscsit_transport iscsi_target_transport = {
672 .transport_type = ISCSI_TCP,
674 .iscsit_setup_np = iscsit_setup_np,
675 .iscsit_accept_np = iscsit_accept_np,
676 .iscsit_free_np = iscsit_free_np,
677 .iscsit_get_login_rx = iscsit_get_login_rx,
678 .iscsit_put_login_tx = iscsit_put_login_tx,
679 .iscsit_get_dataout = iscsit_build_r2ts_for_cmd,
680 .iscsit_immediate_queue = iscsit_immediate_queue,
681 .iscsit_response_queue = iscsit_response_queue,
682 .iscsit_queue_data_in = iscsit_queue_rsp,
683 .iscsit_queue_status = iscsit_queue_rsp,
684 .iscsit_aborted_task = iscsit_aborted_task,
685 .iscsit_xmit_pdu = iscsit_xmit_pdu,
686 .iscsit_get_rx_pdu = iscsit_get_rx_pdu,
687 .iscsit_get_sup_prot_ops = iscsit_get_sup_prot_ops,
690 static int __init iscsi_target_init_module(void)
694 pr_debug("iSCSI-Target "ISCSIT_VERSION"\n");
696 iscsit_global = kzalloc(sizeof(struct iscsit_global), GFP_KERNEL);
697 if (!iscsit_global) {
698 pr_err("Unable to allocate memory for iscsit_global\n");
701 spin_lock_init(&iscsit_global->ts_bitmap_lock);
702 mutex_init(&auth_id_lock);
703 spin_lock_init(&sess_idr_lock);
707 ret = target_register_template(&iscsi_ops);
711 size = BITS_TO_LONGS(ISCSIT_BITMAP_BITS) * sizeof(long);
712 iscsit_global->ts_bitmap = vzalloc(size);
713 if (!iscsit_global->ts_bitmap) {
714 pr_err("Unable to allocate iscsit_global->ts_bitmap\n");
718 lio_qr_cache = kmem_cache_create("lio_qr_cache",
719 sizeof(struct iscsi_queue_req),
720 __alignof__(struct iscsi_queue_req), 0, NULL);
722 pr_err("nable to kmem_cache_create() for"
727 lio_dr_cache = kmem_cache_create("lio_dr_cache",
728 sizeof(struct iscsi_datain_req),
729 __alignof__(struct iscsi_datain_req), 0, NULL);
731 pr_err("Unable to kmem_cache_create() for"
736 lio_ooo_cache = kmem_cache_create("lio_ooo_cache",
737 sizeof(struct iscsi_ooo_cmdsn),
738 __alignof__(struct iscsi_ooo_cmdsn), 0, NULL);
739 if (!lio_ooo_cache) {
740 pr_err("Unable to kmem_cache_create() for"
745 lio_r2t_cache = kmem_cache_create("lio_r2t_cache",
746 sizeof(struct iscsi_r2t), __alignof__(struct iscsi_r2t),
748 if (!lio_r2t_cache) {
749 pr_err("Unable to kmem_cache_create() for"
754 iscsit_register_transport(&iscsi_target_transport);
756 if (iscsit_load_discovery_tpg() < 0)
761 iscsit_unregister_transport(&iscsi_target_transport);
762 kmem_cache_destroy(lio_r2t_cache);
764 kmem_cache_destroy(lio_ooo_cache);
766 kmem_cache_destroy(lio_dr_cache);
768 kmem_cache_destroy(lio_qr_cache);
770 vfree(iscsit_global->ts_bitmap);
772 /* XXX: this probably wants it to be it's own unwind step.. */
773 if (iscsit_global->discovery_tpg)
774 iscsit_tpg_disable_portal_group(iscsit_global->discovery_tpg, 1);
775 target_unregister_template(&iscsi_ops);
777 kfree(iscsit_global);
781 static void __exit iscsi_target_cleanup_module(void)
783 iscsit_release_discovery_tpg();
784 iscsit_unregister_transport(&iscsi_target_transport);
785 kmem_cache_destroy(lio_qr_cache);
786 kmem_cache_destroy(lio_dr_cache);
787 kmem_cache_destroy(lio_ooo_cache);
788 kmem_cache_destroy(lio_r2t_cache);
791 * Shutdown discovery sessions and disable discovery TPG
793 if (iscsit_global->discovery_tpg)
794 iscsit_tpg_disable_portal_group(iscsit_global->discovery_tpg, 1);
796 target_unregister_template(&iscsi_ops);
798 vfree(iscsit_global->ts_bitmap);
799 kfree(iscsit_global);
802 int iscsit_add_reject(
803 struct iscsi_conn *conn,
807 struct iscsi_cmd *cmd;
809 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
813 cmd->iscsi_opcode = ISCSI_OP_REJECT;
814 cmd->reject_reason = reason;
816 cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
818 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
819 iscsit_free_cmd(cmd, false);
823 spin_lock_bh(&conn->cmd_lock);
824 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
825 spin_unlock_bh(&conn->cmd_lock);
827 cmd->i_state = ISTATE_SEND_REJECT;
828 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
832 EXPORT_SYMBOL(iscsit_add_reject);
834 static int iscsit_add_reject_from_cmd(
835 struct iscsi_cmd *cmd,
840 struct iscsi_conn *conn;
843 pr_err("cmd->conn is NULL for ITT: 0x%08x\n",
849 cmd->iscsi_opcode = ISCSI_OP_REJECT;
850 cmd->reject_reason = reason;
852 cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
854 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
855 iscsit_free_cmd(cmd, false);
860 spin_lock_bh(&conn->cmd_lock);
861 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
862 spin_unlock_bh(&conn->cmd_lock);
865 cmd->i_state = ISTATE_SEND_REJECT;
866 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
868 * Perform the kref_put now if se_cmd has already been setup by
869 * scsit_setup_scsi_cmd()
871 if (cmd->se_cmd.se_tfo != NULL) {
872 pr_debug("iscsi reject: calling target_put_sess_cmd >>>>>>\n");
873 target_put_sess_cmd(&cmd->se_cmd);
878 static int iscsit_add_reject_cmd(struct iscsi_cmd *cmd, u8 reason,
881 return iscsit_add_reject_from_cmd(cmd, reason, true, buf);
884 int iscsit_reject_cmd(struct iscsi_cmd *cmd, u8 reason, unsigned char *buf)
886 return iscsit_add_reject_from_cmd(cmd, reason, false, buf);
888 EXPORT_SYMBOL(iscsit_reject_cmd);
891 * Map some portion of the allocated scatterlist to an iovec, suitable for
892 * kernel sockets to copy data in/out.
894 static int iscsit_map_iovec(
895 struct iscsi_cmd *cmd,
901 struct scatterlist *sg;
902 unsigned int page_off;
905 * We know each entry in t_data_sg contains a page.
907 sg = &cmd->se_cmd.t_data_sg[data_offset / PAGE_SIZE];
908 page_off = (data_offset % PAGE_SIZE);
910 cmd->first_data_sg = sg;
911 cmd->first_data_sg_off = page_off;
913 while (data_length) {
914 u32 cur_len = min_t(u32, data_length, sg->length - page_off);
916 iov[i].iov_base = kmap(sg_page(sg)) + sg->offset + page_off;
917 iov[i].iov_len = cur_len;
919 data_length -= cur_len;
925 cmd->kmapped_nents = i;
930 static void iscsit_unmap_iovec(struct iscsi_cmd *cmd)
933 struct scatterlist *sg;
935 sg = cmd->first_data_sg;
937 for (i = 0; i < cmd->kmapped_nents; i++)
938 kunmap(sg_page(&sg[i]));
941 static void iscsit_ack_from_expstatsn(struct iscsi_conn *conn, u32 exp_statsn)
944 struct iscsi_cmd *cmd, *cmd_p;
946 conn->exp_statsn = exp_statsn;
948 if (conn->sess->sess_ops->RDMAExtensions)
951 spin_lock_bh(&conn->cmd_lock);
952 list_for_each_entry_safe(cmd, cmd_p, &conn->conn_cmd_list, i_conn_node) {
953 spin_lock(&cmd->istate_lock);
954 if ((cmd->i_state == ISTATE_SENT_STATUS) &&
955 iscsi_sna_lt(cmd->stat_sn, exp_statsn)) {
956 cmd->i_state = ISTATE_REMOVE;
957 spin_unlock(&cmd->istate_lock);
958 list_move_tail(&cmd->i_conn_node, &ack_list);
961 spin_unlock(&cmd->istate_lock);
963 spin_unlock_bh(&conn->cmd_lock);
965 list_for_each_entry_safe(cmd, cmd_p, &ack_list, i_conn_node) {
966 list_del_init(&cmd->i_conn_node);
967 iscsit_free_cmd(cmd, false);
971 static int iscsit_allocate_iovecs(struct iscsi_cmd *cmd)
973 u32 iov_count = max(1UL, DIV_ROUND_UP(cmd->se_cmd.data_length, PAGE_SIZE));
975 iov_count += ISCSI_IOV_DATA_BUFFER;
977 cmd->iov_data = kzalloc(iov_count * sizeof(struct kvec), GFP_KERNEL);
978 if (!cmd->iov_data) {
979 pr_err("Unable to allocate cmd->iov_data\n");
983 cmd->orig_iov_data_count = iov_count;
987 int iscsit_setup_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
990 int data_direction, payload_length;
991 struct iscsi_scsi_req *hdr;
995 atomic_long_inc(&conn->sess->cmd_pdus);
997 hdr = (struct iscsi_scsi_req *) buf;
998 payload_length = ntoh24(hdr->dlength);
1000 /* FIXME; Add checks for AdditionalHeaderSegment */
1002 if (!(hdr->flags & ISCSI_FLAG_CMD_WRITE) &&
1003 !(hdr->flags & ISCSI_FLAG_CMD_FINAL)) {
1004 pr_err("ISCSI_FLAG_CMD_WRITE & ISCSI_FLAG_CMD_FINAL"
1005 " not set. Bad iSCSI Initiator.\n");
1006 return iscsit_add_reject_cmd(cmd,
1007 ISCSI_REASON_BOOKMARK_INVALID, buf);
1010 if (((hdr->flags & ISCSI_FLAG_CMD_READ) ||
1011 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) && !hdr->data_length) {
1013 * From RFC-3720 Section 10.3.1:
1015 * "Either or both of R and W MAY be 1 when either the
1016 * Expected Data Transfer Length and/or Bidirectional Read
1017 * Expected Data Transfer Length are 0"
1019 * For this case, go ahead and clear the unnecssary bits
1020 * to avoid any confusion with ->data_direction.
1022 hdr->flags &= ~ISCSI_FLAG_CMD_READ;
1023 hdr->flags &= ~ISCSI_FLAG_CMD_WRITE;
1025 pr_warn("ISCSI_FLAG_CMD_READ or ISCSI_FLAG_CMD_WRITE"
1026 " set when Expected Data Transfer Length is 0 for"
1027 " CDB: 0x%02x, Fixing up flags\n", hdr->cdb[0]);
1030 if (!(hdr->flags & ISCSI_FLAG_CMD_READ) &&
1031 !(hdr->flags & ISCSI_FLAG_CMD_WRITE) && (hdr->data_length != 0)) {
1032 pr_err("ISCSI_FLAG_CMD_READ and/or ISCSI_FLAG_CMD_WRITE"
1033 " MUST be set if Expected Data Transfer Length is not 0."
1034 " Bad iSCSI Initiator\n");
1035 return iscsit_add_reject_cmd(cmd,
1036 ISCSI_REASON_BOOKMARK_INVALID, buf);
1039 if ((hdr->flags & ISCSI_FLAG_CMD_READ) &&
1040 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) {
1041 pr_err("Bidirectional operations not supported!\n");
1042 return iscsit_add_reject_cmd(cmd,
1043 ISCSI_REASON_BOOKMARK_INVALID, buf);
1046 if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
1047 pr_err("Illegally set Immediate Bit in iSCSI Initiator"
1048 " Scsi Command PDU.\n");
1049 return iscsit_add_reject_cmd(cmd,
1050 ISCSI_REASON_BOOKMARK_INVALID, buf);
1053 if (payload_length && !conn->sess->sess_ops->ImmediateData) {
1054 pr_err("ImmediateData=No but DataSegmentLength=%u,"
1055 " protocol error.\n", payload_length);
1056 return iscsit_add_reject_cmd(cmd,
1057 ISCSI_REASON_PROTOCOL_ERROR, buf);
1060 if ((be32_to_cpu(hdr->data_length) == payload_length) &&
1061 (!(hdr->flags & ISCSI_FLAG_CMD_FINAL))) {
1062 pr_err("Expected Data Transfer Length and Length of"
1063 " Immediate Data are the same, but ISCSI_FLAG_CMD_FINAL"
1064 " bit is not set protocol error\n");
1065 return iscsit_add_reject_cmd(cmd,
1066 ISCSI_REASON_PROTOCOL_ERROR, buf);
1069 if (payload_length > be32_to_cpu(hdr->data_length)) {
1070 pr_err("DataSegmentLength: %u is greater than"
1071 " EDTL: %u, protocol error.\n", payload_length,
1073 return iscsit_add_reject_cmd(cmd,
1074 ISCSI_REASON_PROTOCOL_ERROR, buf);
1077 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1078 pr_err("DataSegmentLength: %u is greater than"
1079 " MaxXmitDataSegmentLength: %u, protocol error.\n",
1080 payload_length, conn->conn_ops->MaxXmitDataSegmentLength);
1081 return iscsit_add_reject_cmd(cmd,
1082 ISCSI_REASON_PROTOCOL_ERROR, buf);
1085 if (payload_length > conn->sess->sess_ops->FirstBurstLength) {
1086 pr_err("DataSegmentLength: %u is greater than"
1087 " FirstBurstLength: %u, protocol error.\n",
1088 payload_length, conn->sess->sess_ops->FirstBurstLength);
1089 return iscsit_add_reject_cmd(cmd,
1090 ISCSI_REASON_BOOKMARK_INVALID, buf);
1093 data_direction = (hdr->flags & ISCSI_FLAG_CMD_WRITE) ? DMA_TO_DEVICE :
1094 (hdr->flags & ISCSI_FLAG_CMD_READ) ? DMA_FROM_DEVICE :
1097 cmd->data_direction = data_direction;
1098 iscsi_task_attr = hdr->flags & ISCSI_FLAG_CMD_ATTR_MASK;
1100 * Figure out the SAM Task Attribute for the incoming SCSI CDB
1102 if ((iscsi_task_attr == ISCSI_ATTR_UNTAGGED) ||
1103 (iscsi_task_attr == ISCSI_ATTR_SIMPLE))
1104 sam_task_attr = TCM_SIMPLE_TAG;
1105 else if (iscsi_task_attr == ISCSI_ATTR_ORDERED)
1106 sam_task_attr = TCM_ORDERED_TAG;
1107 else if (iscsi_task_attr == ISCSI_ATTR_HEAD_OF_QUEUE)
1108 sam_task_attr = TCM_HEAD_TAG;
1109 else if (iscsi_task_attr == ISCSI_ATTR_ACA)
1110 sam_task_attr = TCM_ACA_TAG;
1112 pr_debug("Unknown iSCSI Task Attribute: 0x%02x, using"
1113 " TCM_SIMPLE_TAG\n", iscsi_task_attr);
1114 sam_task_attr = TCM_SIMPLE_TAG;
1117 cmd->iscsi_opcode = ISCSI_OP_SCSI_CMD;
1118 cmd->i_state = ISTATE_NEW_CMD;
1119 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
1120 cmd->immediate_data = (payload_length) ? 1 : 0;
1121 cmd->unsolicited_data = ((!(hdr->flags & ISCSI_FLAG_CMD_FINAL) &&
1122 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) ? 1 : 0);
1123 if (cmd->unsolicited_data)
1124 cmd->cmd_flags |= ICF_NON_IMMEDIATE_UNSOLICITED_DATA;
1126 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
1127 if (hdr->flags & ISCSI_FLAG_CMD_READ)
1128 cmd->targ_xfer_tag = session_get_next_ttt(conn->sess);
1130 cmd->targ_xfer_tag = 0xFFFFFFFF;
1131 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
1132 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
1133 cmd->first_burst_len = payload_length;
1135 if (!conn->sess->sess_ops->RDMAExtensions &&
1136 cmd->data_direction == DMA_FROM_DEVICE) {
1137 struct iscsi_datain_req *dr;
1139 dr = iscsit_allocate_datain_req();
1141 return iscsit_add_reject_cmd(cmd,
1142 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1144 iscsit_attach_datain_req(cmd, dr);
1148 * Initialize struct se_cmd descriptor from target_core_mod infrastructure
1150 transport_init_se_cmd(&cmd->se_cmd, &iscsi_ops,
1151 conn->sess->se_sess, be32_to_cpu(hdr->data_length),
1152 cmd->data_direction, sam_task_attr,
1153 cmd->sense_buffer + 2);
1155 pr_debug("Got SCSI Command, ITT: 0x%08x, CmdSN: 0x%08x,"
1156 " ExpXferLen: %u, Length: %u, CID: %hu\n", hdr->itt,
1157 hdr->cmdsn, be32_to_cpu(hdr->data_length), payload_length,
1160 target_get_sess_cmd(&cmd->se_cmd, true);
1162 cmd->sense_reason = transport_lookup_cmd_lun(&cmd->se_cmd,
1163 scsilun_to_int(&hdr->lun));
1164 if (cmd->sense_reason)
1167 /* only used for printks or comparing with ->ref_task_tag */
1168 cmd->se_cmd.tag = (__force u32)cmd->init_task_tag;
1169 cmd->sense_reason = target_setup_cmd_from_cdb(&cmd->se_cmd, hdr->cdb);
1170 if (cmd->sense_reason) {
1171 if (cmd->sense_reason == TCM_OUT_OF_RESOURCES) {
1172 return iscsit_add_reject_cmd(cmd,
1173 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1179 if (iscsit_build_pdu_and_seq_lists(cmd, payload_length) < 0) {
1180 return iscsit_add_reject_cmd(cmd,
1181 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1185 spin_lock_bh(&conn->cmd_lock);
1186 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1187 spin_unlock_bh(&conn->cmd_lock);
1189 * Check if we need to delay processing because of ALUA
1190 * Active/NonOptimized primary access state..
1192 core_alua_check_nonop_delay(&cmd->se_cmd);
1196 EXPORT_SYMBOL(iscsit_setup_scsi_cmd);
1198 void iscsit_set_unsoliticed_dataout(struct iscsi_cmd *cmd)
1200 iscsit_set_dataout_sequence_values(cmd);
1202 spin_lock_bh(&cmd->dataout_timeout_lock);
1203 iscsit_start_dataout_timer(cmd, cmd->conn);
1204 spin_unlock_bh(&cmd->dataout_timeout_lock);
1206 EXPORT_SYMBOL(iscsit_set_unsoliticed_dataout);
1208 int iscsit_process_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1209 struct iscsi_scsi_req *hdr)
1213 * Check the CmdSN against ExpCmdSN/MaxCmdSN here if
1214 * the Immediate Bit is not set, and no Immediate
1217 * A PDU/CmdSN carrying Immediate Data can only
1218 * be processed after the DataCRC has passed.
1219 * If the DataCRC fails, the CmdSN MUST NOT
1220 * be acknowledged. (See below)
1222 if (!cmd->immediate_data) {
1223 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
1224 (unsigned char *)hdr, hdr->cmdsn);
1225 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1227 else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
1228 target_put_sess_cmd(&cmd->se_cmd);
1233 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1236 * If no Immediate Data is attached, it's OK to return now.
1238 if (!cmd->immediate_data) {
1239 if (!cmd->sense_reason && cmd->unsolicited_data)
1240 iscsit_set_unsoliticed_dataout(cmd);
1241 if (!cmd->sense_reason)
1244 target_put_sess_cmd(&cmd->se_cmd);
1249 * Early CHECK_CONDITIONs with ImmediateData never make it to command
1250 * execution. These exceptions are processed in CmdSN order using
1251 * iscsit_check_received_cmdsn() in iscsit_get_immediate_data() below.
1253 if (cmd->sense_reason) {
1254 if (cmd->reject_reason)
1260 * Call directly into transport_generic_new_cmd() to perform
1261 * the backend memory allocation.
1263 cmd->sense_reason = transport_generic_new_cmd(&cmd->se_cmd);
1264 if (cmd->sense_reason)
1269 EXPORT_SYMBOL(iscsit_process_scsi_cmd);
1272 iscsit_get_immediate_data(struct iscsi_cmd *cmd, struct iscsi_scsi_req *hdr,
1275 int cmdsn_ret = 0, immed_ret = IMMEDIATE_DATA_NORMAL_OPERATION;
1277 * Special case for Unsupported SAM WRITE Opcodes and ImmediateData=Yes.
1280 goto after_immediate_data;
1282 immed_ret = iscsit_handle_immediate_data(cmd, hdr,
1283 cmd->first_burst_len);
1284 after_immediate_data:
1285 if (immed_ret == IMMEDIATE_DATA_NORMAL_OPERATION) {
1287 * A PDU/CmdSN carrying Immediate Data passed
1288 * DataCRC, check against ExpCmdSN/MaxCmdSN if
1289 * Immediate Bit is not set.
1291 cmdsn_ret = iscsit_sequence_cmd(cmd->conn, cmd,
1292 (unsigned char *)hdr, hdr->cmdsn);
1293 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1296 if (cmd->sense_reason || cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
1299 rc = iscsit_dump_data_payload(cmd->conn,
1300 cmd->first_burst_len, 1);
1301 target_put_sess_cmd(&cmd->se_cmd);
1303 } else if (cmd->unsolicited_data)
1304 iscsit_set_unsoliticed_dataout(cmd);
1306 } else if (immed_ret == IMMEDIATE_DATA_ERL1_CRC_FAILURE) {
1308 * Immediate Data failed DataCRC and ERL>=1,
1309 * silently drop this PDU and let the initiator
1310 * plug the CmdSN gap.
1312 * FIXME: Send Unsolicited NOPIN with reserved
1313 * TTT here to help the initiator figure out
1314 * the missing CmdSN, although they should be
1315 * intelligent enough to determine the missing
1316 * CmdSN and issue a retry to plug the sequence.
1318 cmd->i_state = ISTATE_REMOVE;
1319 iscsit_add_cmd_to_immediate_queue(cmd, cmd->conn, cmd->i_state);
1320 } else /* immed_ret == IMMEDIATE_DATA_CANNOT_RECOVER */
1327 iscsit_handle_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1330 struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)buf;
1332 bool dump_payload = false;
1334 rc = iscsit_setup_scsi_cmd(conn, cmd, buf);
1338 * Allocation iovecs needed for struct socket operations for
1339 * traditional iSCSI block I/O.
1341 if (iscsit_allocate_iovecs(cmd) < 0) {
1342 return iscsit_reject_cmd(cmd,
1343 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1345 immed_data = cmd->immediate_data;
1347 rc = iscsit_process_scsi_cmd(conn, cmd, hdr);
1351 dump_payload = true;
1356 return iscsit_get_immediate_data(cmd, hdr, dump_payload);
1359 static u32 iscsit_do_crypto_hash_sg(
1360 struct ahash_request *hash,
1361 struct iscsi_cmd *cmd,
1368 struct scatterlist *sg;
1369 unsigned int page_off;
1371 crypto_ahash_init(hash);
1373 sg = cmd->first_data_sg;
1374 page_off = cmd->first_data_sg_off;
1376 while (data_length) {
1377 u32 cur_len = min_t(u32, data_length, (sg->length - page_off));
1379 ahash_request_set_crypt(hash, sg, NULL, cur_len);
1380 crypto_ahash_update(hash);
1382 data_length -= cur_len;
1384 /* iscsit_map_iovec has already checked for invalid sg pointers */
1389 struct scatterlist pad_sg;
1391 sg_init_one(&pad_sg, pad_bytes, padding);
1392 ahash_request_set_crypt(hash, &pad_sg, (u8 *)&data_crc,
1394 crypto_ahash_finup(hash);
1396 ahash_request_set_crypt(hash, NULL, (u8 *)&data_crc, 0);
1397 crypto_ahash_final(hash);
1403 static void iscsit_do_crypto_hash_buf(
1404 struct ahash_request *hash,
1411 struct scatterlist sg[2];
1413 sg_init_table(sg, ARRAY_SIZE(sg));
1414 sg_set_buf(sg, buf, payload_length);
1415 sg_set_buf(sg + 1, pad_bytes, padding);
1417 ahash_request_set_crypt(hash, sg, data_crc, payload_length + padding);
1419 crypto_ahash_digest(hash);
1423 iscsit_check_dataout_hdr(struct iscsi_conn *conn, unsigned char *buf,
1424 struct iscsi_cmd **out_cmd)
1426 struct iscsi_data *hdr = (struct iscsi_data *)buf;
1427 struct iscsi_cmd *cmd = NULL;
1428 struct se_cmd *se_cmd;
1429 u32 payload_length = ntoh24(hdr->dlength);
1432 if (!payload_length) {
1433 pr_warn("DataOUT payload is ZERO, ignoring.\n");
1438 atomic_long_add(payload_length, &conn->sess->rx_data_octets);
1440 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1441 pr_err("DataSegmentLength: %u is greater than"
1442 " MaxXmitDataSegmentLength: %u\n", payload_length,
1443 conn->conn_ops->MaxXmitDataSegmentLength);
1444 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1448 cmd = iscsit_find_cmd_from_itt_or_dump(conn, hdr->itt,
1453 pr_debug("Got DataOut ITT: 0x%08x, TTT: 0x%08x,"
1454 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
1455 hdr->itt, hdr->ttt, hdr->datasn, ntohl(hdr->offset),
1456 payload_length, conn->cid);
1458 if (cmd->cmd_flags & ICF_GOT_LAST_DATAOUT) {
1459 pr_err("Command ITT: 0x%08x received DataOUT after"
1460 " last DataOUT received, dumping payload\n",
1461 cmd->init_task_tag);
1462 return iscsit_dump_data_payload(conn, payload_length, 1);
1465 if (cmd->data_direction != DMA_TO_DEVICE) {
1466 pr_err("Command ITT: 0x%08x received DataOUT for a"
1467 " NON-WRITE command.\n", cmd->init_task_tag);
1468 return iscsit_dump_data_payload(conn, payload_length, 1);
1470 se_cmd = &cmd->se_cmd;
1471 iscsit_mod_dataout_timer(cmd);
1473 if ((be32_to_cpu(hdr->offset) + payload_length) > cmd->se_cmd.data_length) {
1474 pr_err("DataOut Offset: %u, Length %u greater than"
1475 " iSCSI Command EDTL %u, protocol error.\n",
1476 hdr->offset, payload_length, cmd->se_cmd.data_length);
1477 return iscsit_reject_cmd(cmd, ISCSI_REASON_BOOKMARK_INVALID, buf);
1480 if (cmd->unsolicited_data) {
1481 int dump_unsolicited_data = 0;
1483 if (conn->sess->sess_ops->InitialR2T) {
1484 pr_err("Received unexpected unsolicited data"
1485 " while InitialR2T=Yes, protocol error.\n");
1486 transport_send_check_condition_and_sense(&cmd->se_cmd,
1487 TCM_UNEXPECTED_UNSOLICITED_DATA, 0);
1491 * Special case for dealing with Unsolicited DataOUT
1492 * and Unsupported SAM WRITE Opcodes and SE resource allocation
1496 /* Something's amiss if we're not in WRITE_PENDING state... */
1497 WARN_ON(se_cmd->t_state != TRANSPORT_WRITE_PENDING);
1498 if (!(se_cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE))
1499 dump_unsolicited_data = 1;
1501 if (dump_unsolicited_data) {
1503 * Check if a delayed TASK_ABORTED status needs to
1504 * be sent now if the ISCSI_FLAG_CMD_FINAL has been
1505 * received with the unsolicited data out.
1507 if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1508 iscsit_stop_dataout_timer(cmd);
1510 transport_check_aborted_status(se_cmd,
1511 (hdr->flags & ISCSI_FLAG_CMD_FINAL));
1512 return iscsit_dump_data_payload(conn, payload_length, 1);
1516 * For the normal solicited data path:
1518 * Check for a delayed TASK_ABORTED status and dump any
1519 * incoming data out payload if one exists. Also, when the
1520 * ISCSI_FLAG_CMD_FINAL is set to denote the end of the current
1521 * data out sequence, we decrement outstanding_r2ts. Once
1522 * outstanding_r2ts reaches zero, go ahead and send the delayed
1523 * TASK_ABORTED status.
1525 if (se_cmd->transport_state & CMD_T_ABORTED) {
1526 if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1527 if (--cmd->outstanding_r2ts < 1) {
1528 iscsit_stop_dataout_timer(cmd);
1529 transport_check_aborted_status(
1533 return iscsit_dump_data_payload(conn, payload_length, 1);
1537 * Preform DataSN, DataSequenceInOrder, DataPDUInOrder, and
1538 * within-command recovery checks before receiving the payload.
1540 rc = iscsit_check_pre_dataout(cmd, buf);
1541 if (rc == DATAOUT_WITHIN_COMMAND_RECOVERY)
1543 else if (rc == DATAOUT_CANNOT_RECOVER)
1549 EXPORT_SYMBOL(iscsit_check_dataout_hdr);
1552 iscsit_get_dataout(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1553 struct iscsi_data *hdr)
1556 u32 checksum, iov_count = 0, padding = 0, rx_got = 0, rx_size = 0;
1557 u32 payload_length = ntoh24(hdr->dlength);
1558 int iov_ret, data_crc_failed = 0;
1560 rx_size += payload_length;
1561 iov = &cmd->iov_data[0];
1563 iov_ret = iscsit_map_iovec(cmd, iov, be32_to_cpu(hdr->offset),
1568 iov_count += iov_ret;
1570 padding = ((-payload_length) & 3);
1572 iov[iov_count].iov_base = cmd->pad_bytes;
1573 iov[iov_count++].iov_len = padding;
1575 pr_debug("Receiving %u padding bytes.\n", padding);
1578 if (conn->conn_ops->DataDigest) {
1579 iov[iov_count].iov_base = &checksum;
1580 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
1581 rx_size += ISCSI_CRC_LEN;
1584 rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
1586 iscsit_unmap_iovec(cmd);
1588 if (rx_got != rx_size)
1591 if (conn->conn_ops->DataDigest) {
1594 data_crc = iscsit_do_crypto_hash_sg(conn->conn_rx_hash, cmd,
1595 be32_to_cpu(hdr->offset),
1596 payload_length, padding,
1599 if (checksum != data_crc) {
1600 pr_err("ITT: 0x%08x, Offset: %u, Length: %u,"
1601 " DataSN: 0x%08x, CRC32C DataDigest 0x%08x"
1602 " does not match computed 0x%08x\n",
1603 hdr->itt, hdr->offset, payload_length,
1604 hdr->datasn, checksum, data_crc);
1605 data_crc_failed = 1;
1607 pr_debug("Got CRC32C DataDigest 0x%08x for"
1608 " %u bytes of Data Out\n", checksum,
1613 return data_crc_failed;
1617 iscsit_check_dataout_payload(struct iscsi_cmd *cmd, struct iscsi_data *hdr,
1618 bool data_crc_failed)
1620 struct iscsi_conn *conn = cmd->conn;
1623 * Increment post receive data and CRC values or perform
1624 * within-command recovery.
1626 rc = iscsit_check_post_dataout(cmd, (unsigned char *)hdr, data_crc_failed);
1627 if ((rc == DATAOUT_NORMAL) || (rc == DATAOUT_WITHIN_COMMAND_RECOVERY))
1629 else if (rc == DATAOUT_SEND_R2T) {
1630 iscsit_set_dataout_sequence_values(cmd);
1631 conn->conn_transport->iscsit_get_dataout(conn, cmd, false);
1632 } else if (rc == DATAOUT_SEND_TO_TRANSPORT) {
1634 * Handle extra special case for out of order
1635 * Unsolicited Data Out.
1637 spin_lock_bh(&cmd->istate_lock);
1638 ooo_cmdsn = (cmd->cmd_flags & ICF_OOO_CMDSN);
1639 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1640 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1641 spin_unlock_bh(&cmd->istate_lock);
1643 iscsit_stop_dataout_timer(cmd);
1646 target_execute_cmd(&cmd->se_cmd);
1648 } else /* DATAOUT_CANNOT_RECOVER */
1653 EXPORT_SYMBOL(iscsit_check_dataout_payload);
1655 static int iscsit_handle_data_out(struct iscsi_conn *conn, unsigned char *buf)
1657 struct iscsi_cmd *cmd = NULL;
1658 struct iscsi_data *hdr = (struct iscsi_data *)buf;
1660 bool data_crc_failed = false;
1662 rc = iscsit_check_dataout_hdr(conn, buf, &cmd);
1668 rc = iscsit_get_dataout(conn, cmd, hdr);
1672 data_crc_failed = true;
1674 return iscsit_check_dataout_payload(cmd, hdr, data_crc_failed);
1677 int iscsit_setup_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1678 struct iscsi_nopout *hdr)
1680 u32 payload_length = ntoh24(hdr->dlength);
1682 if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL)) {
1683 pr_err("NopOUT Flag's, Left Most Bit not set, protocol error.\n");
1685 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1686 (unsigned char *)hdr);
1688 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1689 (unsigned char *)hdr);
1692 if (hdr->itt == RESERVED_ITT && !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1693 pr_err("NOPOUT ITT is reserved, but Immediate Bit is"
1694 " not set, protocol error.\n");
1696 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1697 (unsigned char *)hdr);
1699 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1700 (unsigned char *)hdr);
1703 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1704 pr_err("NOPOUT Ping Data DataSegmentLength: %u is"
1705 " greater than MaxXmitDataSegmentLength: %u, protocol"
1706 " error.\n", payload_length,
1707 conn->conn_ops->MaxXmitDataSegmentLength);
1709 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1710 (unsigned char *)hdr);
1712 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1713 (unsigned char *)hdr);
1716 pr_debug("Got NOPOUT Ping %s ITT: 0x%08x, TTT: 0x%08x,"
1717 " CmdSN: 0x%08x, ExpStatSN: 0x%08x, Length: %u\n",
1718 hdr->itt == RESERVED_ITT ? "Response" : "Request",
1719 hdr->itt, hdr->ttt, hdr->cmdsn, hdr->exp_statsn,
1722 * This is not a response to a Unsolicited NopIN, which means
1723 * it can either be a NOPOUT ping request (with a valid ITT),
1724 * or a NOPOUT not requesting a NOPIN (with a reserved ITT).
1725 * Either way, make sure we allocate an struct iscsi_cmd, as both
1726 * can contain ping data.
1728 if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
1729 cmd->iscsi_opcode = ISCSI_OP_NOOP_OUT;
1730 cmd->i_state = ISTATE_SEND_NOPIN;
1731 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ?
1733 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
1734 cmd->targ_xfer_tag = 0xFFFFFFFF;
1735 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
1736 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
1737 cmd->data_direction = DMA_NONE;
1742 EXPORT_SYMBOL(iscsit_setup_nop_out);
1744 int iscsit_process_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1745 struct iscsi_nopout *hdr)
1747 struct iscsi_cmd *cmd_p = NULL;
1750 * Initiator is expecting a NopIN ping reply..
1752 if (hdr->itt != RESERVED_ITT) {
1754 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1755 (unsigned char *)hdr);
1757 spin_lock_bh(&conn->cmd_lock);
1758 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1759 spin_unlock_bh(&conn->cmd_lock);
1761 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1763 if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
1764 iscsit_add_cmd_to_response_queue(cmd, conn,
1769 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
1770 (unsigned char *)hdr, hdr->cmdsn);
1771 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
1773 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1779 * This was a response to a unsolicited NOPIN ping.
1781 if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) {
1782 cmd_p = iscsit_find_cmd_from_ttt(conn, be32_to_cpu(hdr->ttt));
1786 iscsit_stop_nopin_response_timer(conn);
1788 cmd_p->i_state = ISTATE_REMOVE;
1789 iscsit_add_cmd_to_immediate_queue(cmd_p, conn, cmd_p->i_state);
1791 iscsit_start_nopin_timer(conn);
1795 * Otherwise, initiator is not expecting a NOPIN is response.
1796 * Just ignore for now.
1800 EXPORT_SYMBOL(iscsit_process_nop_out);
1802 static int iscsit_handle_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1805 unsigned char *ping_data = NULL;
1806 struct iscsi_nopout *hdr = (struct iscsi_nopout *)buf;
1807 struct kvec *iov = NULL;
1808 u32 payload_length = ntoh24(hdr->dlength);
1811 ret = iscsit_setup_nop_out(conn, cmd, hdr);
1815 * Handle NOP-OUT payload for traditional iSCSI sockets
1817 if (payload_length && hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
1818 u32 checksum, data_crc, padding = 0;
1819 int niov = 0, rx_got, rx_size = payload_length;
1821 ping_data = kzalloc(payload_length + 1, GFP_KERNEL);
1823 pr_err("Unable to allocate memory for"
1824 " NOPOUT ping data.\n");
1829 iov = &cmd->iov_misc[0];
1830 iov[niov].iov_base = ping_data;
1831 iov[niov++].iov_len = payload_length;
1833 padding = ((-payload_length) & 3);
1835 pr_debug("Receiving %u additional bytes"
1836 " for padding.\n", padding);
1837 iov[niov].iov_base = &cmd->pad_bytes;
1838 iov[niov++].iov_len = padding;
1841 if (conn->conn_ops->DataDigest) {
1842 iov[niov].iov_base = &checksum;
1843 iov[niov++].iov_len = ISCSI_CRC_LEN;
1844 rx_size += ISCSI_CRC_LEN;
1847 rx_got = rx_data(conn, &cmd->iov_misc[0], niov, rx_size);
1848 if (rx_got != rx_size) {
1853 if (conn->conn_ops->DataDigest) {
1854 iscsit_do_crypto_hash_buf(conn->conn_rx_hash,
1855 ping_data, payload_length,
1856 padding, cmd->pad_bytes,
1859 if (checksum != data_crc) {
1860 pr_err("Ping data CRC32C DataDigest"
1861 " 0x%08x does not match computed 0x%08x\n",
1862 checksum, data_crc);
1863 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
1864 pr_err("Unable to recover from"
1865 " NOPOUT Ping DataCRC failure while in"
1871 * Silently drop this PDU and let the
1872 * initiator plug the CmdSN gap.
1874 pr_debug("Dropping NOPOUT"
1875 " Command CmdSN: 0x%08x due to"
1876 " DataCRC error.\n", hdr->cmdsn);
1881 pr_debug("Got CRC32C DataDigest"
1882 " 0x%08x for %u bytes of ping data.\n",
1883 checksum, payload_length);
1887 ping_data[payload_length] = '\0';
1889 * Attach ping data to struct iscsi_cmd->buf_ptr.
1891 cmd->buf_ptr = ping_data;
1892 cmd->buf_ptr_size = payload_length;
1894 pr_debug("Got %u bytes of NOPOUT ping"
1895 " data.\n", payload_length);
1896 pr_debug("Ping Data: \"%s\"\n", ping_data);
1899 return iscsit_process_nop_out(conn, cmd, hdr);
1902 iscsit_free_cmd(cmd, false);
1909 iscsit_handle_task_mgt_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1912 struct se_tmr_req *se_tmr;
1913 struct iscsi_tmr_req *tmr_req;
1914 struct iscsi_tm *hdr;
1915 int out_of_order_cmdsn = 0, ret;
1916 bool sess_ref = false;
1919 hdr = (struct iscsi_tm *) buf;
1920 hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;
1921 function = hdr->flags;
1923 pr_debug("Got Task Management Request ITT: 0x%08x, CmdSN:"
1924 " 0x%08x, Function: 0x%02x, RefTaskTag: 0x%08x, RefCmdSN:"
1925 " 0x%08x, CID: %hu\n", hdr->itt, hdr->cmdsn, function,
1926 hdr->rtt, hdr->refcmdsn, conn->cid);
1928 if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1929 ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
1930 hdr->rtt != RESERVED_ITT)) {
1931 pr_err("RefTaskTag should be set to 0xFFFFFFFF.\n");
1932 hdr->rtt = RESERVED_ITT;
1935 if ((function == ISCSI_TM_FUNC_TASK_REASSIGN) &&
1936 !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1937 pr_err("Task Management Request TASK_REASSIGN not"
1938 " issued as immediate command, bad iSCSI Initiator"
1939 "implementation\n");
1940 return iscsit_add_reject_cmd(cmd,
1941 ISCSI_REASON_PROTOCOL_ERROR, buf);
1943 if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1944 be32_to_cpu(hdr->refcmdsn) != ISCSI_RESERVED_TAG)
1945 hdr->refcmdsn = cpu_to_be32(ISCSI_RESERVED_TAG);
1947 cmd->data_direction = DMA_NONE;
1949 cmd->tmr_req = kzalloc(sizeof(struct iscsi_tmr_req), GFP_KERNEL);
1950 if (!cmd->tmr_req) {
1951 pr_err("Unable to allocate memory for"
1952 " Task Management command!\n");
1953 return iscsit_add_reject_cmd(cmd,
1954 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1959 * TASK_REASSIGN for ERL=2 / connection stays inside of
1960 * LIO-Target $FABRIC_MOD
1962 if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
1967 transport_init_se_cmd(&cmd->se_cmd, &iscsi_ops,
1968 conn->sess->se_sess, 0, DMA_NONE,
1969 TCM_SIMPLE_TAG, cmd->sense_buffer + 2);
1971 target_get_sess_cmd(&cmd->se_cmd, true);
1975 case ISCSI_TM_FUNC_ABORT_TASK:
1976 tcm_function = TMR_ABORT_TASK;
1978 case ISCSI_TM_FUNC_ABORT_TASK_SET:
1979 tcm_function = TMR_ABORT_TASK_SET;
1981 case ISCSI_TM_FUNC_CLEAR_ACA:
1982 tcm_function = TMR_CLEAR_ACA;
1984 case ISCSI_TM_FUNC_CLEAR_TASK_SET:
1985 tcm_function = TMR_CLEAR_TASK_SET;
1987 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
1988 tcm_function = TMR_LUN_RESET;
1990 case ISCSI_TM_FUNC_TARGET_WARM_RESET:
1991 tcm_function = TMR_TARGET_WARM_RESET;
1993 case ISCSI_TM_FUNC_TARGET_COLD_RESET:
1994 tcm_function = TMR_TARGET_COLD_RESET;
1997 pr_err("Unknown iSCSI TMR Function:"
1998 " 0x%02x\n", function);
1999 return iscsit_add_reject_cmd(cmd,
2000 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
2003 ret = core_tmr_alloc_req(&cmd->se_cmd, cmd->tmr_req,
2004 tcm_function, GFP_KERNEL);
2006 return iscsit_add_reject_cmd(cmd,
2007 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
2009 cmd->tmr_req->se_tmr_req = cmd->se_cmd.se_tmr_req;
2012 cmd->iscsi_opcode = ISCSI_OP_SCSI_TMFUNC;
2013 cmd->i_state = ISTATE_SEND_TASKMGTRSP;
2014 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2015 cmd->init_task_tag = hdr->itt;
2016 cmd->targ_xfer_tag = 0xFFFFFFFF;
2017 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
2018 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
2019 se_tmr = cmd->se_cmd.se_tmr_req;
2020 tmr_req = cmd->tmr_req;
2022 * Locate the struct se_lun for all TMRs not related to ERL=2 TASK_REASSIGN
2024 if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
2025 ret = transport_lookup_tmr_lun(&cmd->se_cmd,
2026 scsilun_to_int(&hdr->lun));
2028 se_tmr->response = ISCSI_TMF_RSP_NO_LUN;
2034 case ISCSI_TM_FUNC_ABORT_TASK:
2035 se_tmr->response = iscsit_tmr_abort_task(cmd, buf);
2036 if (se_tmr->response)
2039 case ISCSI_TM_FUNC_ABORT_TASK_SET:
2040 case ISCSI_TM_FUNC_CLEAR_ACA:
2041 case ISCSI_TM_FUNC_CLEAR_TASK_SET:
2042 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
2044 case ISCSI_TM_FUNC_TARGET_WARM_RESET:
2045 if (iscsit_tmr_task_warm_reset(conn, tmr_req, buf) < 0) {
2046 se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
2050 case ISCSI_TM_FUNC_TARGET_COLD_RESET:
2051 if (iscsit_tmr_task_cold_reset(conn, tmr_req, buf) < 0) {
2052 se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
2056 case ISCSI_TM_FUNC_TASK_REASSIGN:
2057 se_tmr->response = iscsit_tmr_task_reassign(cmd, buf);
2059 * Perform sanity checks on the ExpDataSN only if the
2060 * TASK_REASSIGN was successful.
2062 if (se_tmr->response)
2065 if (iscsit_check_task_reassign_expdatasn(tmr_req, conn) < 0)
2066 return iscsit_add_reject_cmd(cmd,
2067 ISCSI_REASON_BOOKMARK_INVALID, buf);
2070 pr_err("Unknown TMR function: 0x%02x, protocol"
2071 " error.\n", function);
2072 se_tmr->response = ISCSI_TMF_RSP_NOT_SUPPORTED;
2076 if ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
2077 (se_tmr->response == ISCSI_TMF_RSP_COMPLETE))
2078 se_tmr->call_transport = 1;
2080 spin_lock_bh(&conn->cmd_lock);
2081 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2082 spin_unlock_bh(&conn->cmd_lock);
2084 if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
2085 int cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
2086 if (cmdsn_ret == CMDSN_HIGHER_THAN_EXP)
2087 out_of_order_cmdsn = 1;
2088 else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
2090 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2093 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2095 if (out_of_order_cmdsn || !(hdr->opcode & ISCSI_OP_IMMEDIATE))
2098 * Found the referenced task, send to transport for processing.
2100 if (se_tmr->call_transport)
2101 return transport_generic_handle_tmr(&cmd->se_cmd);
2104 * Could not find the referenced LUN, task, or Task Management
2105 * command not authorized or supported. Change state and
2106 * let the tx_thread send the response.
2108 * For connection recovery, this is also the default action for
2109 * TMR TASK_REASSIGN.
2112 pr_debug("Handle TMR, using sess_ref=true check\n");
2113 target_put_sess_cmd(&cmd->se_cmd);
2116 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2119 EXPORT_SYMBOL(iscsit_handle_task_mgt_cmd);
2121 /* #warning FIXME: Support Text Command parameters besides SendTargets */
2123 iscsit_setup_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2124 struct iscsi_text *hdr)
2126 u32 payload_length = ntoh24(hdr->dlength);
2128 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
2129 pr_err("Unable to accept text parameter length: %u"
2130 "greater than MaxXmitDataSegmentLength %u.\n",
2131 payload_length, conn->conn_ops->MaxXmitDataSegmentLength);
2132 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
2133 (unsigned char *)hdr);
2136 if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL) ||
2137 (hdr->flags & ISCSI_FLAG_TEXT_CONTINUE)) {
2138 pr_err("Multi sequence text commands currently not supported\n");
2139 return iscsit_reject_cmd(cmd, ISCSI_REASON_CMD_NOT_SUPPORTED,
2140 (unsigned char *)hdr);
2143 pr_debug("Got Text Request: ITT: 0x%08x, CmdSN: 0x%08x,"
2144 " ExpStatSN: 0x%08x, Length: %u\n", hdr->itt, hdr->cmdsn,
2145 hdr->exp_statsn, payload_length);
2147 cmd->iscsi_opcode = ISCSI_OP_TEXT;
2148 cmd->i_state = ISTATE_SEND_TEXTRSP;
2149 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2150 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
2151 cmd->targ_xfer_tag = 0xFFFFFFFF;
2152 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
2153 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
2154 cmd->data_direction = DMA_NONE;
2155 cmd->text_in_ptr = NULL;
2159 EXPORT_SYMBOL(iscsit_setup_text_cmd);
2162 iscsit_process_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2163 struct iscsi_text *hdr)
2165 unsigned char *text_in = cmd->text_in_ptr, *text_ptr;
2169 cmd->targ_xfer_tag = be32_to_cpu(hdr->ttt);
2170 if (cmd->targ_xfer_tag == 0xFFFFFFFF) {
2171 pr_err("Unable to locate text_in buffer for sendtargets"
2175 goto empty_sendtargets;
2177 if (strncmp("SendTargets", text_in, 11) != 0) {
2178 pr_err("Received Text Data that is not"
2179 " SendTargets, cannot continue.\n");
2182 text_ptr = strchr(text_in, '=');
2184 pr_err("No \"=\" separator found in Text Data,"
2185 " cannot continue.\n");
2188 if (!strncmp("=All", text_ptr, 4)) {
2189 cmd->cmd_flags |= ICF_SENDTARGETS_ALL;
2190 } else if (!strncmp("=iqn.", text_ptr, 5) ||
2191 !strncmp("=eui.", text_ptr, 5)) {
2192 cmd->cmd_flags |= ICF_SENDTARGETS_SINGLE;
2194 pr_err("Unable to locate valid SendTargets=%s value\n", text_ptr);
2198 spin_lock_bh(&conn->cmd_lock);
2199 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2200 spin_unlock_bh(&conn->cmd_lock);
2203 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2205 if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
2206 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
2207 (unsigned char *)hdr, hdr->cmdsn);
2208 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2214 return iscsit_execute_cmd(cmd, 0);
2217 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
2218 (unsigned char *)hdr);
2220 EXPORT_SYMBOL(iscsit_process_text_cmd);
2223 iscsit_handle_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2226 struct iscsi_text *hdr = (struct iscsi_text *)buf;
2227 char *text_in = NULL;
2228 u32 payload_length = ntoh24(hdr->dlength);
2231 rc = iscsit_setup_text_cmd(conn, cmd, hdr);
2235 rx_size = payload_length;
2236 if (payload_length) {
2237 u32 checksum = 0, data_crc = 0;
2238 u32 padding = 0, pad_bytes = 0;
2239 int niov = 0, rx_got;
2242 text_in = kzalloc(payload_length, GFP_KERNEL);
2244 pr_err("Unable to allocate memory for"
2245 " incoming text parameters\n");
2248 cmd->text_in_ptr = text_in;
2250 memset(iov, 0, 3 * sizeof(struct kvec));
2251 iov[niov].iov_base = text_in;
2252 iov[niov++].iov_len = payload_length;
2254 padding = ((-payload_length) & 3);
2256 iov[niov].iov_base = &pad_bytes;
2257 iov[niov++].iov_len = padding;
2259 pr_debug("Receiving %u additional bytes"
2260 " for padding.\n", padding);
2262 if (conn->conn_ops->DataDigest) {
2263 iov[niov].iov_base = &checksum;
2264 iov[niov++].iov_len = ISCSI_CRC_LEN;
2265 rx_size += ISCSI_CRC_LEN;
2268 rx_got = rx_data(conn, &iov[0], niov, rx_size);
2269 if (rx_got != rx_size)
2272 if (conn->conn_ops->DataDigest) {
2273 iscsit_do_crypto_hash_buf(conn->conn_rx_hash,
2274 text_in, payload_length,
2275 padding, (u8 *)&pad_bytes,
2278 if (checksum != data_crc) {
2279 pr_err("Text data CRC32C DataDigest"
2280 " 0x%08x does not match computed"
2281 " 0x%08x\n", checksum, data_crc);
2282 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2283 pr_err("Unable to recover from"
2284 " Text Data digest failure while in"
2289 * Silently drop this PDU and let the
2290 * initiator plug the CmdSN gap.
2292 pr_debug("Dropping Text"
2293 " Command CmdSN: 0x%08x due to"
2294 " DataCRC error.\n", hdr->cmdsn);
2299 pr_debug("Got CRC32C DataDigest"
2300 " 0x%08x for %u bytes of text data.\n",
2301 checksum, payload_length);
2304 text_in[payload_length - 1] = '\0';
2305 pr_debug("Successfully read %d bytes of text"
2306 " data.\n", payload_length);
2309 return iscsit_process_text_cmd(conn, cmd, hdr);
2312 kfree(cmd->text_in_ptr);
2313 cmd->text_in_ptr = NULL;
2314 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, buf);
2317 int iscsit_logout_closesession(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2319 struct iscsi_conn *conn_p;
2320 struct iscsi_session *sess = conn->sess;
2322 pr_debug("Received logout request CLOSESESSION on CID: %hu"
2323 " for SID: %u.\n", conn->cid, conn->sess->sid);
2325 atomic_set(&sess->session_logout, 1);
2326 atomic_set(&conn->conn_logout_remove, 1);
2327 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_SESSION;
2329 iscsit_inc_conn_usage_count(conn);
2330 iscsit_inc_session_usage_count(sess);
2332 spin_lock_bh(&sess->conn_lock);
2333 list_for_each_entry(conn_p, &sess->sess_conn_list, conn_list) {
2334 if (conn_p->conn_state != TARG_CONN_STATE_LOGGED_IN)
2337 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2338 conn_p->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2340 spin_unlock_bh(&sess->conn_lock);
2342 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2347 int iscsit_logout_closeconnection(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2349 struct iscsi_conn *l_conn;
2350 struct iscsi_session *sess = conn->sess;
2352 pr_debug("Received logout request CLOSECONNECTION for CID:"
2353 " %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2356 * A Logout Request with a CLOSECONNECTION reason code for a CID
2357 * can arrive on a connection with a differing CID.
2359 if (conn->cid == cmd->logout_cid) {
2360 spin_lock_bh(&conn->state_lock);
2361 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2362 conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2364 atomic_set(&conn->conn_logout_remove, 1);
2365 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_CONNECTION;
2366 iscsit_inc_conn_usage_count(conn);
2368 spin_unlock_bh(&conn->state_lock);
2371 * Handle all different cid CLOSECONNECTION requests in
2372 * iscsit_logout_post_handler_diffcid() as to give enough
2373 * time for any non immediate command's CmdSN to be
2374 * acknowledged on the connection in question.
2376 * Here we simply make sure the CID is still around.
2378 l_conn = iscsit_get_conn_from_cid(sess,
2381 cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2382 iscsit_add_cmd_to_response_queue(cmd, conn,
2387 iscsit_dec_conn_usage_count(l_conn);
2390 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2395 int iscsit_logout_removeconnforrecovery(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2397 struct iscsi_session *sess = conn->sess;
2399 pr_debug("Received explicit REMOVECONNFORRECOVERY logout for"
2400 " CID: %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2402 if (sess->sess_ops->ErrorRecoveryLevel != 2) {
2403 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2404 " while ERL!=2.\n");
2405 cmd->logout_response = ISCSI_LOGOUT_RECOVERY_UNSUPPORTED;
2406 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2410 if (conn->cid == cmd->logout_cid) {
2411 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2412 " with CID: %hu on CID: %hu, implementation error.\n",
2413 cmd->logout_cid, conn->cid);
2414 cmd->logout_response = ISCSI_LOGOUT_CLEANUP_FAILED;
2415 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2419 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2425 iscsit_handle_logout_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2428 int cmdsn_ret, logout_remove = 0;
2430 struct iscsi_logout *hdr;
2431 struct iscsi_tiqn *tiqn = iscsit_snmp_get_tiqn(conn);
2433 hdr = (struct iscsi_logout *) buf;
2434 reason_code = (hdr->flags & 0x7f);
2437 spin_lock(&tiqn->logout_stats.lock);
2438 if (reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION)
2439 tiqn->logout_stats.normal_logouts++;
2441 tiqn->logout_stats.abnormal_logouts++;
2442 spin_unlock(&tiqn->logout_stats.lock);
2445 pr_debug("Got Logout Request ITT: 0x%08x CmdSN: 0x%08x"
2446 " ExpStatSN: 0x%08x Reason: 0x%02x CID: %hu on CID: %hu\n",
2447 hdr->itt, hdr->cmdsn, hdr->exp_statsn, reason_code,
2448 hdr->cid, conn->cid);
2450 if (conn->conn_state != TARG_CONN_STATE_LOGGED_IN) {
2451 pr_err("Received logout request on connection that"
2452 " is not in logged in state, ignoring request.\n");
2453 iscsit_free_cmd(cmd, false);
2457 cmd->iscsi_opcode = ISCSI_OP_LOGOUT;
2458 cmd->i_state = ISTATE_SEND_LOGOUTRSP;
2459 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2460 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
2461 cmd->targ_xfer_tag = 0xFFFFFFFF;
2462 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
2463 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
2464 cmd->logout_cid = be16_to_cpu(hdr->cid);
2465 cmd->logout_reason = reason_code;
2466 cmd->data_direction = DMA_NONE;
2469 * We need to sleep in these cases (by returning 1) until the Logout
2470 * Response gets sent in the tx thread.
2472 if ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION) ||
2473 ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION) &&
2474 be16_to_cpu(hdr->cid) == conn->cid))
2477 spin_lock_bh(&conn->cmd_lock);
2478 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2479 spin_unlock_bh(&conn->cmd_lock);
2481 if (reason_code != ISCSI_LOGOUT_REASON_RECOVERY)
2482 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2485 * Immediate commands are executed, well, immediately.
2486 * Non-Immediate Logout Commands are executed in CmdSN order.
2488 if (cmd->immediate_cmd) {
2489 int ret = iscsit_execute_cmd(cmd, 0);
2494 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
2495 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
2497 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2501 return logout_remove;
2503 EXPORT_SYMBOL(iscsit_handle_logout_cmd);
2505 int iscsit_handle_snack(
2506 struct iscsi_conn *conn,
2509 struct iscsi_snack *hdr;
2511 hdr = (struct iscsi_snack *) buf;
2512 hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;
2514 pr_debug("Got ISCSI_INIT_SNACK, ITT: 0x%08x, ExpStatSN:"
2515 " 0x%08x, Type: 0x%02x, BegRun: 0x%08x, RunLength: 0x%08x,"
2516 " CID: %hu\n", hdr->itt, hdr->exp_statsn, hdr->flags,
2517 hdr->begrun, hdr->runlength, conn->cid);
2519 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2520 pr_err("Initiator sent SNACK request while in"
2521 " ErrorRecoveryLevel=0.\n");
2522 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2526 * SNACK_DATA and SNACK_R2T are both 0, so check which function to
2527 * call from inside iscsi_send_recovery_datain_or_r2t().
2529 switch (hdr->flags & ISCSI_FLAG_SNACK_TYPE_MASK) {
2531 return iscsit_handle_recovery_datain_or_r2t(conn, buf,
2533 be32_to_cpu(hdr->ttt),
2534 be32_to_cpu(hdr->begrun),
2535 be32_to_cpu(hdr->runlength));
2536 case ISCSI_FLAG_SNACK_TYPE_STATUS:
2537 return iscsit_handle_status_snack(conn, hdr->itt,
2538 be32_to_cpu(hdr->ttt),
2539 be32_to_cpu(hdr->begrun), be32_to_cpu(hdr->runlength));
2540 case ISCSI_FLAG_SNACK_TYPE_DATA_ACK:
2541 return iscsit_handle_data_ack(conn, be32_to_cpu(hdr->ttt),
2542 be32_to_cpu(hdr->begrun),
2543 be32_to_cpu(hdr->runlength));
2544 case ISCSI_FLAG_SNACK_TYPE_RDATA:
2545 /* FIXME: Support R-Data SNACK */
2546 pr_err("R-Data SNACK Not Supported.\n");
2547 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2550 pr_err("Unknown SNACK type 0x%02x, protocol"
2551 " error.\n", hdr->flags & 0x0f);
2552 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2558 EXPORT_SYMBOL(iscsit_handle_snack);
2560 static void iscsit_rx_thread_wait_for_tcp(struct iscsi_conn *conn)
2562 if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2563 (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2564 wait_for_completion_interruptible_timeout(
2565 &conn->rx_half_close_comp,
2566 ISCSI_RX_THREAD_TCP_TIMEOUT * HZ);
2570 static int iscsit_handle_immediate_data(
2571 struct iscsi_cmd *cmd,
2572 struct iscsi_scsi_req *hdr,
2575 int iov_ret, rx_got = 0, rx_size = 0;
2576 u32 checksum, iov_count = 0, padding = 0;
2577 struct iscsi_conn *conn = cmd->conn;
2580 iov_ret = iscsit_map_iovec(cmd, cmd->iov_data, cmd->write_data_done, length);
2582 return IMMEDIATE_DATA_CANNOT_RECOVER;
2585 iov_count = iov_ret;
2586 iov = &cmd->iov_data[0];
2588 padding = ((-length) & 3);
2590 iov[iov_count].iov_base = cmd->pad_bytes;
2591 iov[iov_count++].iov_len = padding;
2595 if (conn->conn_ops->DataDigest) {
2596 iov[iov_count].iov_base = &checksum;
2597 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
2598 rx_size += ISCSI_CRC_LEN;
2601 rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
2603 iscsit_unmap_iovec(cmd);
2605 if (rx_got != rx_size) {
2606 iscsit_rx_thread_wait_for_tcp(conn);
2607 return IMMEDIATE_DATA_CANNOT_RECOVER;
2610 if (conn->conn_ops->DataDigest) {
2613 data_crc = iscsit_do_crypto_hash_sg(conn->conn_rx_hash, cmd,
2614 cmd->write_data_done, length, padding,
2617 if (checksum != data_crc) {
2618 pr_err("ImmediateData CRC32C DataDigest 0x%08x"
2619 " does not match computed 0x%08x\n", checksum,
2622 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2623 pr_err("Unable to recover from"
2624 " Immediate Data digest failure while"
2626 iscsit_reject_cmd(cmd,
2627 ISCSI_REASON_DATA_DIGEST_ERROR,
2628 (unsigned char *)hdr);
2629 return IMMEDIATE_DATA_CANNOT_RECOVER;
2631 iscsit_reject_cmd(cmd,
2632 ISCSI_REASON_DATA_DIGEST_ERROR,
2633 (unsigned char *)hdr);
2634 return IMMEDIATE_DATA_ERL1_CRC_FAILURE;
2637 pr_debug("Got CRC32C DataDigest 0x%08x for"
2638 " %u bytes of Immediate Data\n", checksum,
2643 cmd->write_data_done += length;
2645 if (cmd->write_data_done == cmd->se_cmd.data_length) {
2646 spin_lock_bh(&cmd->istate_lock);
2647 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
2648 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
2649 spin_unlock_bh(&cmd->istate_lock);
2652 return IMMEDIATE_DATA_NORMAL_OPERATION;
2656 * Called with sess->conn_lock held.
2658 /* #warning iscsi_build_conn_drop_async_message() only sends out on connections
2659 with active network interface */
2660 static void iscsit_build_conn_drop_async_message(struct iscsi_conn *conn)
2662 struct iscsi_cmd *cmd;
2663 struct iscsi_conn *conn_p;
2667 * Only send a Asynchronous Message on connections whos network
2668 * interface is still functional.
2670 list_for_each_entry(conn_p, &conn->sess->sess_conn_list, conn_list) {
2671 if (conn_p->conn_state == TARG_CONN_STATE_LOGGED_IN) {
2672 iscsit_inc_conn_usage_count(conn_p);
2681 cmd = iscsit_allocate_cmd(conn_p, TASK_RUNNING);
2683 iscsit_dec_conn_usage_count(conn_p);
2687 cmd->logout_cid = conn->cid;
2688 cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2689 cmd->i_state = ISTATE_SEND_ASYNCMSG;
2691 spin_lock_bh(&conn_p->cmd_lock);
2692 list_add_tail(&cmd->i_conn_node, &conn_p->conn_cmd_list);
2693 spin_unlock_bh(&conn_p->cmd_lock);
2695 iscsit_add_cmd_to_response_queue(cmd, conn_p, cmd->i_state);
2696 iscsit_dec_conn_usage_count(conn_p);
2699 static int iscsit_send_conn_drop_async_message(
2700 struct iscsi_cmd *cmd,
2701 struct iscsi_conn *conn)
2703 struct iscsi_async *hdr;
2705 cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2707 hdr = (struct iscsi_async *) cmd->pdu;
2708 hdr->opcode = ISCSI_OP_ASYNC_EVENT;
2709 hdr->flags = ISCSI_FLAG_CMD_FINAL;
2710 cmd->init_task_tag = RESERVED_ITT;
2711 cmd->targ_xfer_tag = 0xFFFFFFFF;
2712 put_unaligned_be64(0xFFFFFFFFFFFFFFFFULL, &hdr->rsvd4[0]);
2713 cmd->stat_sn = conn->stat_sn++;
2714 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2715 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2716 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2717 hdr->async_event = ISCSI_ASYNC_MSG_DROPPING_CONNECTION;
2718 hdr->param1 = cpu_to_be16(cmd->logout_cid);
2719 hdr->param2 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Wait);
2720 hdr->param3 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Retain);
2722 pr_debug("Sending Connection Dropped Async Message StatSN:"
2723 " 0x%08x, for CID: %hu on CID: %hu\n", cmd->stat_sn,
2724 cmd->logout_cid, conn->cid);
2726 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
2729 static void iscsit_tx_thread_wait_for_tcp(struct iscsi_conn *conn)
2731 if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2732 (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2733 wait_for_completion_interruptible_timeout(
2734 &conn->tx_half_close_comp,
2735 ISCSI_TX_THREAD_TCP_TIMEOUT * HZ);
2740 iscsit_build_datain_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2741 struct iscsi_datain *datain, struct iscsi_data_rsp *hdr,
2744 hdr->opcode = ISCSI_OP_SCSI_DATA_IN;
2745 hdr->flags = datain->flags;
2746 if (hdr->flags & ISCSI_FLAG_DATA_STATUS) {
2747 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
2748 hdr->flags |= ISCSI_FLAG_DATA_OVERFLOW;
2749 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2750 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
2751 hdr->flags |= ISCSI_FLAG_DATA_UNDERFLOW;
2752 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2755 hton24(hdr->dlength, datain->length);
2756 if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2757 int_to_scsilun(cmd->se_cmd.orig_fe_lun,
2758 (struct scsi_lun *)&hdr->lun);
2760 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2762 hdr->itt = cmd->init_task_tag;
2764 if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2765 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
2767 hdr->ttt = cpu_to_be32(0xFFFFFFFF);
2769 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2771 hdr->statsn = cpu_to_be32(0xFFFFFFFF);
2773 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2774 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2775 hdr->datasn = cpu_to_be32(datain->data_sn);
2776 hdr->offset = cpu_to_be32(datain->offset);
2778 pr_debug("Built DataIN ITT: 0x%08x, StatSN: 0x%08x,"
2779 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
2780 cmd->init_task_tag, ntohl(hdr->statsn), ntohl(hdr->datasn),
2781 ntohl(hdr->offset), datain->length, conn->cid);
2783 EXPORT_SYMBOL(iscsit_build_datain_pdu);
2785 static int iscsit_send_datain(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2787 struct iscsi_data_rsp *hdr = (struct iscsi_data_rsp *)&cmd->pdu[0];
2788 struct iscsi_datain datain;
2789 struct iscsi_datain_req *dr;
2791 bool set_statsn = false;
2793 memset(&datain, 0, sizeof(struct iscsi_datain));
2794 dr = iscsit_get_datain_values(cmd, &datain);
2796 pr_err("iscsit_get_datain_values failed for ITT: 0x%08x\n",
2797 cmd->init_task_tag);
2801 * Be paranoid and double check the logic for now.
2803 if ((datain.offset + datain.length) > cmd->se_cmd.data_length) {
2804 pr_err("Command ITT: 0x%08x, datain.offset: %u and"
2805 " datain.length: %u exceeds cmd->data_length: %u\n",
2806 cmd->init_task_tag, datain.offset, datain.length,
2807 cmd->se_cmd.data_length);
2811 atomic_long_add(datain.length, &conn->sess->tx_data_octets);
2813 * Special case for successfully execution w/ both DATAIN
2816 if ((datain.flags & ISCSI_FLAG_DATA_STATUS) &&
2817 (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE))
2818 datain.flags &= ~ISCSI_FLAG_DATA_STATUS;
2820 if ((dr->dr_complete == DATAIN_COMPLETE_NORMAL) ||
2821 (dr->dr_complete == DATAIN_COMPLETE_CONNECTION_RECOVERY)) {
2822 iscsit_increment_maxcmdsn(cmd, conn->sess);
2823 cmd->stat_sn = conn->stat_sn++;
2825 } else if (dr->dr_complete ==
2826 DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY)
2830 iscsit_build_datain_pdu(cmd, conn, &datain, hdr, set_statsn);
2832 ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, dr, &datain, 0);
2836 if (dr->dr_complete) {
2837 eodr = (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ?
2839 iscsit_free_datain_req(cmd, dr);
2846 iscsit_build_logout_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2847 struct iscsi_logout_rsp *hdr)
2849 struct iscsi_conn *logout_conn = NULL;
2850 struct iscsi_conn_recovery *cr = NULL;
2851 struct iscsi_session *sess = conn->sess;
2853 * The actual shutting down of Sessions and/or Connections
2854 * for CLOSESESSION and CLOSECONNECTION Logout Requests
2855 * is done in scsi_logout_post_handler().
2857 switch (cmd->logout_reason) {
2858 case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
2859 pr_debug("iSCSI session logout successful, setting"
2860 " logout response to ISCSI_LOGOUT_SUCCESS.\n");
2861 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2863 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
2864 if (cmd->logout_response == ISCSI_LOGOUT_CID_NOT_FOUND)
2867 * For CLOSECONNECTION logout requests carrying
2868 * a matching logout CID -> local CID, the reference
2869 * for the local CID will have been incremented in
2870 * iscsi_logout_closeconnection().
2872 * For CLOSECONNECTION logout requests carrying
2873 * a different CID than the connection it arrived
2874 * on, the connection responding to cmd->logout_cid
2875 * is stopped in iscsit_logout_post_handler_diffcid().
2878 pr_debug("iSCSI CID: %hu logout on CID: %hu"
2879 " successful.\n", cmd->logout_cid, conn->cid);
2880 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2882 case ISCSI_LOGOUT_REASON_RECOVERY:
2883 if ((cmd->logout_response == ISCSI_LOGOUT_RECOVERY_UNSUPPORTED) ||
2884 (cmd->logout_response == ISCSI_LOGOUT_CLEANUP_FAILED))
2887 * If the connection is still active from our point of view
2888 * force connection recovery to occur.
2890 logout_conn = iscsit_get_conn_from_cid_rcfr(sess,
2893 iscsit_connection_reinstatement_rcfr(logout_conn);
2894 iscsit_dec_conn_usage_count(logout_conn);
2897 cr = iscsit_get_inactive_connection_recovery_entry(
2898 conn->sess, cmd->logout_cid);
2900 pr_err("Unable to locate CID: %hu for"
2901 " REMOVECONNFORRECOVERY Logout Request.\n",
2903 cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2907 iscsit_discard_cr_cmds_by_expstatsn(cr, cmd->exp_stat_sn);
2909 pr_debug("iSCSI REMOVECONNFORRECOVERY logout"
2910 " for recovery for CID: %hu on CID: %hu successful.\n",
2911 cmd->logout_cid, conn->cid);
2912 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2915 pr_err("Unknown cmd->logout_reason: 0x%02x\n",
2916 cmd->logout_reason);
2920 hdr->opcode = ISCSI_OP_LOGOUT_RSP;
2921 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2922 hdr->response = cmd->logout_response;
2923 hdr->itt = cmd->init_task_tag;
2924 cmd->stat_sn = conn->stat_sn++;
2925 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2927 iscsit_increment_maxcmdsn(cmd, conn->sess);
2928 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2929 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2931 pr_debug("Built Logout Response ITT: 0x%08x StatSN:"
2932 " 0x%08x Response: 0x%02x CID: %hu on CID: %hu\n",
2933 cmd->init_task_tag, cmd->stat_sn, hdr->response,
2934 cmd->logout_cid, conn->cid);
2938 EXPORT_SYMBOL(iscsit_build_logout_rsp);
2941 iscsit_send_logout(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2945 rc = iscsit_build_logout_rsp(cmd, conn,
2946 (struct iscsi_logout_rsp *)&cmd->pdu[0]);
2950 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
2954 iscsit_build_nopin_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2955 struct iscsi_nopin *hdr, bool nopout_response)
2957 hdr->opcode = ISCSI_OP_NOOP_IN;
2958 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2959 hton24(hdr->dlength, cmd->buf_ptr_size);
2960 if (nopout_response)
2961 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2962 hdr->itt = cmd->init_task_tag;
2963 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
2964 cmd->stat_sn = (nopout_response) ? conn->stat_sn++ :
2966 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2968 if (nopout_response)
2969 iscsit_increment_maxcmdsn(cmd, conn->sess);
2971 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2972 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2974 pr_debug("Built NOPIN %s Response ITT: 0x%08x, TTT: 0x%08x,"
2975 " StatSN: 0x%08x, Length %u\n", (nopout_response) ?
2976 "Solicitied" : "Unsolicitied", cmd->init_task_tag,
2977 cmd->targ_xfer_tag, cmd->stat_sn, cmd->buf_ptr_size);
2979 EXPORT_SYMBOL(iscsit_build_nopin_rsp);
2982 * Unsolicited NOPIN, either requesting a response or not.
2984 static int iscsit_send_unsolicited_nopin(
2985 struct iscsi_cmd *cmd,
2986 struct iscsi_conn *conn,
2989 struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
2992 iscsit_build_nopin_rsp(cmd, conn, hdr, false);
2994 pr_debug("Sending Unsolicited NOPIN TTT: 0x%08x StatSN:"
2995 " 0x%08x CID: %hu\n", hdr->ttt, cmd->stat_sn, conn->cid);
2997 ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
3001 spin_lock_bh(&cmd->istate_lock);
3002 cmd->i_state = want_response ?
3003 ISTATE_SENT_NOPIN_WANT_RESPONSE : ISTATE_SENT_STATUS;
3004 spin_unlock_bh(&cmd->istate_lock);
3010 iscsit_send_nopin(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3012 struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
3014 iscsit_build_nopin_rsp(cmd, conn, hdr, true);
3017 * NOPOUT Ping Data is attached to struct iscsi_cmd->buf_ptr.
3018 * NOPOUT DataSegmentLength is at struct iscsi_cmd->buf_ptr_size.
3020 pr_debug("Echoing back %u bytes of ping data.\n", cmd->buf_ptr_size);
3022 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL,
3027 static int iscsit_send_r2t(
3028 struct iscsi_cmd *cmd,
3029 struct iscsi_conn *conn)
3031 struct iscsi_r2t *r2t;
3032 struct iscsi_r2t_rsp *hdr;
3035 r2t = iscsit_get_r2t_from_list(cmd);
3039 hdr = (struct iscsi_r2t_rsp *) cmd->pdu;
3040 memset(hdr, 0, ISCSI_HDR_LEN);
3041 hdr->opcode = ISCSI_OP_R2T;
3042 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3043 int_to_scsilun(cmd->se_cmd.orig_fe_lun,
3044 (struct scsi_lun *)&hdr->lun);
3045 hdr->itt = cmd->init_task_tag;
3046 if (conn->conn_transport->iscsit_get_r2t_ttt)
3047 conn->conn_transport->iscsit_get_r2t_ttt(conn, cmd, r2t);
3049 r2t->targ_xfer_tag = session_get_next_ttt(conn->sess);
3050 hdr->ttt = cpu_to_be32(r2t->targ_xfer_tag);
3051 hdr->statsn = cpu_to_be32(conn->stat_sn);
3052 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3053 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3054 hdr->r2tsn = cpu_to_be32(r2t->r2t_sn);
3055 hdr->data_offset = cpu_to_be32(r2t->offset);
3056 hdr->data_length = cpu_to_be32(r2t->xfer_len);
3058 pr_debug("Built %sR2T, ITT: 0x%08x, TTT: 0x%08x, StatSN:"
3059 " 0x%08x, R2TSN: 0x%08x, Offset: %u, DDTL: %u, CID: %hu\n",
3060 (!r2t->recovery_r2t) ? "" : "Recovery ", cmd->init_task_tag,
3061 r2t->targ_xfer_tag, ntohl(hdr->statsn), r2t->r2t_sn,
3062 r2t->offset, r2t->xfer_len, conn->cid);
3064 spin_lock_bh(&cmd->r2t_lock);
3066 spin_unlock_bh(&cmd->r2t_lock);
3068 ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
3073 spin_lock_bh(&cmd->dataout_timeout_lock);
3074 iscsit_start_dataout_timer(cmd, conn);
3075 spin_unlock_bh(&cmd->dataout_timeout_lock);
3081 * @recovery: If called from iscsi_task_reassign_complete_write() for
3082 * connection recovery.
3084 int iscsit_build_r2ts_for_cmd(
3085 struct iscsi_conn *conn,
3086 struct iscsi_cmd *cmd,
3090 u32 offset = 0, xfer_len = 0;
3092 spin_lock_bh(&cmd->r2t_lock);
3093 if (cmd->cmd_flags & ICF_SENT_LAST_R2T) {
3094 spin_unlock_bh(&cmd->r2t_lock);
3098 if (conn->sess->sess_ops->DataSequenceInOrder &&
3100 cmd->r2t_offset = max(cmd->r2t_offset, cmd->write_data_done);
3102 while (cmd->outstanding_r2ts < conn->sess->sess_ops->MaxOutstandingR2T) {
3103 if (conn->sess->sess_ops->DataSequenceInOrder) {
3104 offset = cmd->r2t_offset;
3106 if (first_r2t && recovery) {
3107 int new_data_end = offset +
3108 conn->sess->sess_ops->MaxBurstLength -
3109 cmd->next_burst_len;
3111 if (new_data_end > cmd->se_cmd.data_length)
3112 xfer_len = cmd->se_cmd.data_length - offset;
3115 conn->sess->sess_ops->MaxBurstLength -
3116 cmd->next_burst_len;
3118 int new_data_end = offset +
3119 conn->sess->sess_ops->MaxBurstLength;
3121 if (new_data_end > cmd->se_cmd.data_length)
3122 xfer_len = cmd->se_cmd.data_length - offset;
3124 xfer_len = conn->sess->sess_ops->MaxBurstLength;
3126 cmd->r2t_offset += xfer_len;
3128 if (cmd->r2t_offset == cmd->se_cmd.data_length)
3129 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3131 struct iscsi_seq *seq;
3133 seq = iscsit_get_seq_holder_for_r2t(cmd);
3135 spin_unlock_bh(&cmd->r2t_lock);
3139 offset = seq->offset;
3140 xfer_len = seq->xfer_len;
3142 if (cmd->seq_send_order == cmd->seq_count)
3143 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3145 cmd->outstanding_r2ts++;
3148 if (iscsit_add_r2t_to_list(cmd, offset, xfer_len, 0, 0) < 0) {
3149 spin_unlock_bh(&cmd->r2t_lock);
3153 if (cmd->cmd_flags & ICF_SENT_LAST_R2T)
3156 spin_unlock_bh(&cmd->r2t_lock);
3160 EXPORT_SYMBOL(iscsit_build_r2ts_for_cmd);
3162 void iscsit_build_rsp_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3163 bool inc_stat_sn, struct iscsi_scsi_rsp *hdr)
3166 cmd->stat_sn = conn->stat_sn++;
3168 atomic_long_inc(&conn->sess->rsp_pdus);
3170 memset(hdr, 0, ISCSI_HDR_LEN);
3171 hdr->opcode = ISCSI_OP_SCSI_CMD_RSP;
3172 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3173 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
3174 hdr->flags |= ISCSI_FLAG_CMD_OVERFLOW;
3175 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3176 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
3177 hdr->flags |= ISCSI_FLAG_CMD_UNDERFLOW;
3178 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3180 hdr->response = cmd->iscsi_response;
3181 hdr->cmd_status = cmd->se_cmd.scsi_status;
3182 hdr->itt = cmd->init_task_tag;
3183 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3185 iscsit_increment_maxcmdsn(cmd, conn->sess);
3186 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3187 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3189 pr_debug("Built SCSI Response, ITT: 0x%08x, StatSN: 0x%08x,"
3190 " Response: 0x%02x, SAM Status: 0x%02x, CID: %hu\n",
3191 cmd->init_task_tag, cmd->stat_sn, cmd->se_cmd.scsi_status,
3192 cmd->se_cmd.scsi_status, conn->cid);
3194 EXPORT_SYMBOL(iscsit_build_rsp_pdu);
3196 static int iscsit_send_response(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3198 struct iscsi_scsi_rsp *hdr = (struct iscsi_scsi_rsp *)&cmd->pdu[0];
3199 bool inc_stat_sn = (cmd->i_state == ISTATE_SEND_STATUS);
3200 void *data_buf = NULL;
3201 u32 padding = 0, data_buf_len = 0;
3203 iscsit_build_rsp_pdu(cmd, conn, inc_stat_sn, hdr);
3206 * Attach SENSE DATA payload to iSCSI Response PDU
3208 if (cmd->se_cmd.sense_buffer &&
3209 ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
3210 (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
3211 put_unaligned_be16(cmd->se_cmd.scsi_sense_length, cmd->sense_buffer);
3212 cmd->se_cmd.scsi_sense_length += sizeof (__be16);
3214 padding = -(cmd->se_cmd.scsi_sense_length) & 3;
3215 hton24(hdr->dlength, (u32)cmd->se_cmd.scsi_sense_length);
3216 data_buf = cmd->sense_buffer;
3217 data_buf_len = cmd->se_cmd.scsi_sense_length + padding;
3220 memset(cmd->sense_buffer +
3221 cmd->se_cmd.scsi_sense_length, 0, padding);
3222 pr_debug("Adding %u bytes of padding to"
3223 " SENSE.\n", padding);
3226 pr_debug("Attaching SENSE DATA: %u bytes to iSCSI"
3228 cmd->se_cmd.scsi_sense_length);
3231 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, data_buf,
3235 static u8 iscsit_convert_tcm_tmr_rsp(struct se_tmr_req *se_tmr)
3237 switch (se_tmr->response) {
3238 case TMR_FUNCTION_COMPLETE:
3239 return ISCSI_TMF_RSP_COMPLETE;
3240 case TMR_TASK_DOES_NOT_EXIST:
3241 return ISCSI_TMF_RSP_NO_TASK;
3242 case TMR_LUN_DOES_NOT_EXIST:
3243 return ISCSI_TMF_RSP_NO_LUN;
3244 case TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED:
3245 return ISCSI_TMF_RSP_NOT_SUPPORTED;
3246 case TMR_FUNCTION_REJECTED:
3248 return ISCSI_TMF_RSP_REJECTED;
3253 iscsit_build_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3254 struct iscsi_tm_rsp *hdr)
3256 struct se_tmr_req *se_tmr = cmd->se_cmd.se_tmr_req;
3258 hdr->opcode = ISCSI_OP_SCSI_TMFUNC_RSP;
3259 hdr->flags = ISCSI_FLAG_CMD_FINAL;
3260 hdr->response = iscsit_convert_tcm_tmr_rsp(se_tmr);
3261 hdr->itt = cmd->init_task_tag;
3262 cmd->stat_sn = conn->stat_sn++;
3263 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3265 iscsit_increment_maxcmdsn(cmd, conn->sess);
3266 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3267 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3269 pr_debug("Built Task Management Response ITT: 0x%08x,"
3270 " StatSN: 0x%08x, Response: 0x%02x, CID: %hu\n",
3271 cmd->init_task_tag, cmd->stat_sn, hdr->response, conn->cid);
3273 EXPORT_SYMBOL(iscsit_build_task_mgt_rsp);
3276 iscsit_send_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3278 struct iscsi_tm_rsp *hdr = (struct iscsi_tm_rsp *)&cmd->pdu[0];
3280 iscsit_build_task_mgt_rsp(cmd, conn, hdr);
3282 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
3285 static bool iscsit_check_inaddr_any(struct iscsi_np *np)
3289 if (np->np_sockaddr.ss_family == AF_INET6) {
3290 const struct sockaddr_in6 sin6 = {
3291 .sin6_addr = IN6ADDR_ANY_INIT };
3292 struct sockaddr_in6 *sock_in6 =
3293 (struct sockaddr_in6 *)&np->np_sockaddr;
3295 if (!memcmp(sock_in6->sin6_addr.s6_addr,
3296 sin6.sin6_addr.s6_addr, 16))
3299 struct sockaddr_in * sock_in =
3300 (struct sockaddr_in *)&np->np_sockaddr;
3302 if (sock_in->sin_addr.s_addr == htonl(INADDR_ANY))
3309 #define SENDTARGETS_BUF_LIMIT 32768U
3312 iscsit_build_sendtargets_response(struct iscsi_cmd *cmd,
3313 enum iscsit_transport_type network_transport,
3314 int skip_bytes, bool *completed)
3316 char *payload = NULL;
3317 struct iscsi_conn *conn = cmd->conn;
3318 struct iscsi_portal_group *tpg;
3319 struct iscsi_tiqn *tiqn;
3320 struct iscsi_tpg_np *tpg_np;
3321 int buffer_len, end_of_buf = 0, len = 0, payload_len = 0;
3322 int target_name_printed;
3323 unsigned char buf[ISCSI_IQN_LEN+12]; /* iqn + "TargetName=" + \0 */
3324 unsigned char *text_in = cmd->text_in_ptr, *text_ptr = NULL;
3327 buffer_len = min(conn->conn_ops->MaxRecvDataSegmentLength,
3328 SENDTARGETS_BUF_LIMIT);
3330 payload = kzalloc(buffer_len, GFP_KERNEL);
3332 pr_err("Unable to allocate memory for sendtargets"
3337 * Locate pointer to iqn./eui. string for ICF_SENDTARGETS_SINGLE
3340 if (cmd->cmd_flags & ICF_SENDTARGETS_SINGLE) {
3341 text_ptr = strchr(text_in, '=');
3343 pr_err("Unable to locate '=' string in text_in:"
3349 * Skip over '=' character..
3354 spin_lock(&tiqn_lock);
3355 list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
3356 if ((cmd->cmd_flags & ICF_SENDTARGETS_SINGLE) &&
3357 strcmp(tiqn->tiqn, text_ptr)) {
3361 target_name_printed = 0;
3363 spin_lock(&tiqn->tiqn_tpg_lock);
3364 list_for_each_entry(tpg, &tiqn->tiqn_tpg_list, tpg_list) {
3366 /* If demo_mode_discovery=0 and generate_node_acls=0
3367 * (demo mode dislabed) do not return
3368 * TargetName+TargetAddress unless a NodeACL exists.
3371 if ((tpg->tpg_attrib.generate_node_acls == 0) &&
3372 (tpg->tpg_attrib.demo_mode_discovery == 0) &&
3373 (!target_tpg_has_node_acl(&tpg->tpg_se_tpg,
3374 cmd->conn->sess->sess_ops->InitiatorName))) {
3378 spin_lock(&tpg->tpg_state_lock);
3379 active = (tpg->tpg_state == TPG_STATE_ACTIVE);
3380 spin_unlock(&tpg->tpg_state_lock);
3382 if (!active && tpg->tpg_attrib.tpg_enabled_sendtargets)
3385 spin_lock(&tpg->tpg_np_lock);
3386 list_for_each_entry(tpg_np, &tpg->tpg_gnp_list,
3388 struct iscsi_np *np = tpg_np->tpg_np;
3389 bool inaddr_any = iscsit_check_inaddr_any(np);
3390 struct sockaddr_storage *sockaddr;
3392 if (np->np_network_transport != network_transport)
3395 if (!target_name_printed) {
3396 len = sprintf(buf, "TargetName=%s",
3400 if ((len + payload_len) > buffer_len) {
3401 spin_unlock(&tpg->tpg_np_lock);
3402 spin_unlock(&tiqn->tiqn_tpg_lock);
3407 if (skip_bytes && len <= skip_bytes) {
3410 memcpy(payload + payload_len, buf, len);
3412 target_name_printed = 1;
3413 if (len > skip_bytes)
3419 sockaddr = &conn->local_sockaddr;
3421 sockaddr = &np->np_sockaddr;
3423 len = sprintf(buf, "TargetAddress="
3429 if ((len + payload_len) > buffer_len) {
3430 spin_unlock(&tpg->tpg_np_lock);
3431 spin_unlock(&tiqn->tiqn_tpg_lock);
3436 if (skip_bytes && len <= skip_bytes) {
3439 memcpy(payload + payload_len, buf, len);
3441 if (len > skip_bytes)
3445 spin_unlock(&tpg->tpg_np_lock);
3447 spin_unlock(&tiqn->tiqn_tpg_lock);
3454 if (cmd->cmd_flags & ICF_SENDTARGETS_SINGLE)
3457 spin_unlock(&tiqn_lock);
3459 cmd->buf_ptr = payload;
3465 iscsit_build_text_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3466 struct iscsi_text_rsp *hdr,
3467 enum iscsit_transport_type network_transport)
3469 int text_length, padding;
3470 bool completed = true;
3472 text_length = iscsit_build_sendtargets_response(cmd, network_transport,
3473 cmd->read_data_done,
3475 if (text_length < 0)
3479 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3481 hdr->flags |= ISCSI_FLAG_TEXT_CONTINUE;
3482 cmd->read_data_done += text_length;
3483 if (cmd->targ_xfer_tag == 0xFFFFFFFF)
3484 cmd->targ_xfer_tag = session_get_next_ttt(conn->sess);
3486 hdr->opcode = ISCSI_OP_TEXT_RSP;
3487 padding = ((-text_length) & 3);
3488 hton24(hdr->dlength, text_length);
3489 hdr->itt = cmd->init_task_tag;
3490 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
3491 cmd->stat_sn = conn->stat_sn++;
3492 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3494 iscsit_increment_maxcmdsn(cmd, conn->sess);
3496 * Reset maxcmdsn_inc in multi-part text payload exchanges to
3497 * correctly increment MaxCmdSN for each response answering a
3498 * non immediate text request with a valid CmdSN.
3500 cmd->maxcmdsn_inc = 0;
3501 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3502 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3504 pr_debug("Built Text Response: ITT: 0x%08x, TTT: 0x%08x, StatSN: 0x%08x,"
3505 " Length: %u, CID: %hu F: %d C: %d\n", cmd->init_task_tag,
3506 cmd->targ_xfer_tag, cmd->stat_sn, text_length, conn->cid,
3507 !!(hdr->flags & ISCSI_FLAG_CMD_FINAL),
3508 !!(hdr->flags & ISCSI_FLAG_TEXT_CONTINUE));
3510 return text_length + padding;
3512 EXPORT_SYMBOL(iscsit_build_text_rsp);
3514 static int iscsit_send_text_rsp(
3515 struct iscsi_cmd *cmd,
3516 struct iscsi_conn *conn)
3518 struct iscsi_text_rsp *hdr = (struct iscsi_text_rsp *)cmd->pdu;
3521 text_length = iscsit_build_text_rsp(cmd, conn, hdr,
3522 conn->conn_transport->transport_type);
3523 if (text_length < 0)
3526 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL,
3532 iscsit_build_reject(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3533 struct iscsi_reject *hdr)
3535 hdr->opcode = ISCSI_OP_REJECT;
3536 hdr->reason = cmd->reject_reason;
3537 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3538 hton24(hdr->dlength, ISCSI_HDR_LEN);
3539 hdr->ffffffff = cpu_to_be32(0xffffffff);
3540 cmd->stat_sn = conn->stat_sn++;
3541 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3542 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3543 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3546 EXPORT_SYMBOL(iscsit_build_reject);
3548 static int iscsit_send_reject(
3549 struct iscsi_cmd *cmd,
3550 struct iscsi_conn *conn)
3552 struct iscsi_reject *hdr = (struct iscsi_reject *)&cmd->pdu[0];
3554 iscsit_build_reject(cmd, conn, hdr);
3556 pr_debug("Built Reject PDU StatSN: 0x%08x, Reason: 0x%02x,"
3557 " CID: %hu\n", ntohl(hdr->statsn), hdr->reason, conn->cid);
3559 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL,
3564 void iscsit_thread_get_cpumask(struct iscsi_conn *conn)
3568 * bitmap_id is assigned from iscsit_global->ts_bitmap from
3569 * within iscsit_start_kthreads()
3571 * Here we use bitmap_id to determine which CPU that this
3572 * iSCSI connection's RX/TX threads will be scheduled to
3575 ord = conn->bitmap_id % cpumask_weight(cpu_online_mask);
3576 for_each_online_cpu(cpu) {
3578 cpumask_set_cpu(cpu, conn->conn_cpumask);
3583 * This should never be reached..
3586 cpumask_setall(conn->conn_cpumask);
3590 iscsit_immediate_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
3595 case ISTATE_SEND_R2T:
3596 ret = iscsit_send_r2t(cmd, conn);
3601 spin_lock_bh(&conn->cmd_lock);
3602 list_del_init(&cmd->i_conn_node);
3603 spin_unlock_bh(&conn->cmd_lock);
3605 iscsit_free_cmd(cmd, false);
3607 case ISTATE_SEND_NOPIN_WANT_RESPONSE:
3608 iscsit_mod_nopin_response_timer(conn);
3609 ret = iscsit_send_unsolicited_nopin(cmd, conn, 1);
3613 case ISTATE_SEND_NOPIN_NO_RESPONSE:
3614 ret = iscsit_send_unsolicited_nopin(cmd, conn, 0);
3619 pr_err("Unknown Opcode: 0x%02x ITT:"
3620 " 0x%08x, i_state: %d on CID: %hu\n",
3621 cmd->iscsi_opcode, cmd->init_task_tag, state,
3631 EXPORT_SYMBOL(iscsit_immediate_queue);
3634 iscsit_handle_immediate_queue(struct iscsi_conn *conn)
3636 struct iscsit_transport *t = conn->conn_transport;
3637 struct iscsi_queue_req *qr;
3638 struct iscsi_cmd *cmd;
3642 while ((qr = iscsit_get_cmd_from_immediate_queue(conn))) {
3643 atomic_set(&conn->check_immediate_queue, 0);
3646 kmem_cache_free(lio_qr_cache, qr);
3648 ret = t->iscsit_immediate_queue(conn, cmd, state);
3657 iscsit_response_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
3663 case ISTATE_SEND_DATAIN:
3664 ret = iscsit_send_datain(cmd, conn);
3669 goto check_rsp_state;
3670 else if (ret == 1) {
3672 spin_lock_bh(&cmd->istate_lock);
3673 cmd->i_state = ISTATE_SENT_STATUS;
3674 spin_unlock_bh(&cmd->istate_lock);
3676 if (atomic_read(&conn->check_immediate_queue))
3680 } else if (ret == 2) {
3681 /* Still must send status,
3682 SCF_TRANSPORT_TASK_SENSE was set */
3683 spin_lock_bh(&cmd->istate_lock);
3684 cmd->i_state = ISTATE_SEND_STATUS;
3685 spin_unlock_bh(&cmd->istate_lock);
3686 state = ISTATE_SEND_STATUS;
3687 goto check_rsp_state;
3691 case ISTATE_SEND_STATUS:
3692 case ISTATE_SEND_STATUS_RECOVERY:
3693 ret = iscsit_send_response(cmd, conn);
3695 case ISTATE_SEND_LOGOUTRSP:
3696 ret = iscsit_send_logout(cmd, conn);
3698 case ISTATE_SEND_ASYNCMSG:
3699 ret = iscsit_send_conn_drop_async_message(
3702 case ISTATE_SEND_NOPIN:
3703 ret = iscsit_send_nopin(cmd, conn);
3705 case ISTATE_SEND_REJECT:
3706 ret = iscsit_send_reject(cmd, conn);
3708 case ISTATE_SEND_TASKMGTRSP:
3709 ret = iscsit_send_task_mgt_rsp(cmd, conn);
3712 ret = iscsit_tmr_post_handler(cmd, conn);
3714 iscsit_fall_back_to_erl0(conn->sess);
3716 case ISTATE_SEND_TEXTRSP:
3717 ret = iscsit_send_text_rsp(cmd, conn);
3720 pr_err("Unknown Opcode: 0x%02x ITT:"
3721 " 0x%08x, i_state: %d on CID: %hu\n",
3722 cmd->iscsi_opcode, cmd->init_task_tag,
3730 case ISTATE_SEND_LOGOUTRSP:
3731 if (!iscsit_logout_post_handler(cmd, conn))
3734 case ISTATE_SEND_STATUS:
3735 case ISTATE_SEND_ASYNCMSG:
3736 case ISTATE_SEND_NOPIN:
3737 case ISTATE_SEND_STATUS_RECOVERY:
3738 case ISTATE_SEND_TEXTRSP:
3739 case ISTATE_SEND_TASKMGTRSP:
3740 case ISTATE_SEND_REJECT:
3741 spin_lock_bh(&cmd->istate_lock);
3742 cmd->i_state = ISTATE_SENT_STATUS;
3743 spin_unlock_bh(&cmd->istate_lock);
3746 pr_err("Unknown Opcode: 0x%02x ITT:"
3747 " 0x%08x, i_state: %d on CID: %hu\n",
3748 cmd->iscsi_opcode, cmd->init_task_tag,
3749 cmd->i_state, conn->cid);
3753 if (atomic_read(&conn->check_immediate_queue))
3761 EXPORT_SYMBOL(iscsit_response_queue);
3763 static int iscsit_handle_response_queue(struct iscsi_conn *conn)
3765 struct iscsit_transport *t = conn->conn_transport;
3766 struct iscsi_queue_req *qr;
3767 struct iscsi_cmd *cmd;
3771 while ((qr = iscsit_get_cmd_from_response_queue(conn))) {
3774 kmem_cache_free(lio_qr_cache, qr);
3776 ret = t->iscsit_response_queue(conn, cmd, state);
3777 if (ret == 1 || ret < 0)
3784 int iscsi_target_tx_thread(void *arg)
3787 struct iscsi_conn *conn = arg;
3789 * Allow ourselves to be interrupted by SIGINT so that a
3790 * connection recovery / failure event can be triggered externally.
3792 allow_signal(SIGINT);
3794 while (!kthread_should_stop()) {
3796 * Ensure that both TX and RX per connection kthreads
3797 * are scheduled to run on the same CPU.
3799 iscsit_thread_check_cpumask(conn, current, 1);
3801 wait_event_interruptible(conn->queues_wq,
3802 !iscsit_conn_all_queues_empty(conn));
3804 if (signal_pending(current))
3808 ret = iscsit_handle_immediate_queue(conn);
3812 ret = iscsit_handle_response_queue(conn);
3815 else if (ret == -ECONNRESET)
3823 * Avoid the normal connection failure code-path if this connection
3824 * is still within LOGIN mode, and iscsi_np process context is
3825 * responsible for cleaning up the early connection failure.
3827 if (conn->conn_state != TARG_CONN_STATE_IN_LOGIN)
3828 iscsit_take_action_for_connection_exit(conn);
3833 static int iscsi_target_rx_opcode(struct iscsi_conn *conn, unsigned char *buf)
3835 struct iscsi_hdr *hdr = (struct iscsi_hdr *)buf;
3836 struct iscsi_cmd *cmd;
3839 switch (hdr->opcode & ISCSI_OPCODE_MASK) {
3840 case ISCSI_OP_SCSI_CMD:
3841 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3845 ret = iscsit_handle_scsi_cmd(conn, cmd, buf);
3847 case ISCSI_OP_SCSI_DATA_OUT:
3848 ret = iscsit_handle_data_out(conn, buf);
3850 case ISCSI_OP_NOOP_OUT:
3852 if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
3853 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3857 ret = iscsit_handle_nop_out(conn, cmd, buf);
3859 case ISCSI_OP_SCSI_TMFUNC:
3860 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3864 ret = iscsit_handle_task_mgt_cmd(conn, cmd, buf);
3867 if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) {
3868 cmd = iscsit_find_cmd_from_itt(conn, hdr->itt);
3872 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3877 ret = iscsit_handle_text_cmd(conn, cmd, buf);
3879 case ISCSI_OP_LOGOUT:
3880 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3884 ret = iscsit_handle_logout_cmd(conn, cmd, buf);
3886 wait_for_completion_timeout(&conn->conn_logout_comp,
3887 SECONDS_FOR_LOGOUT_COMP * HZ);
3889 case ISCSI_OP_SNACK:
3890 ret = iscsit_handle_snack(conn, buf);
3893 pr_err("Got unknown iSCSI OpCode: 0x%02x\n", hdr->opcode);
3894 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
3895 pr_err("Cannot recover from unknown"
3896 " opcode while ERL=0, closing iSCSI connection.\n");
3899 pr_err("Unable to recover from unknown opcode while OFMarker=No,"
3900 " closing iSCSI connection.\n");
3907 return iscsit_add_reject(conn, ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
3910 static bool iscsi_target_check_conn_state(struct iscsi_conn *conn)
3914 spin_lock_bh(&conn->state_lock);
3915 ret = (conn->conn_state != TARG_CONN_STATE_LOGGED_IN);
3916 spin_unlock_bh(&conn->state_lock);
3921 static void iscsit_get_rx_pdu(struct iscsi_conn *conn)
3924 u8 buffer[ISCSI_HDR_LEN], opcode;
3925 u32 checksum = 0, digest = 0;
3928 while (!kthread_should_stop()) {
3930 * Ensure that both TX and RX per connection kthreads
3931 * are scheduled to run on the same CPU.
3933 iscsit_thread_check_cpumask(conn, current, 0);
3935 memset(buffer, 0, ISCSI_HDR_LEN);
3936 memset(&iov, 0, sizeof(struct kvec));
3938 iov.iov_base = buffer;
3939 iov.iov_len = ISCSI_HDR_LEN;
3941 ret = rx_data(conn, &iov, 1, ISCSI_HDR_LEN);
3942 if (ret != ISCSI_HDR_LEN) {
3943 iscsit_rx_thread_wait_for_tcp(conn);
3947 if (conn->conn_ops->HeaderDigest) {
3948 iov.iov_base = &digest;
3949 iov.iov_len = ISCSI_CRC_LEN;
3951 ret = rx_data(conn, &iov, 1, ISCSI_CRC_LEN);
3952 if (ret != ISCSI_CRC_LEN) {
3953 iscsit_rx_thread_wait_for_tcp(conn);
3957 iscsit_do_crypto_hash_buf(conn->conn_rx_hash,
3958 buffer, ISCSI_HDR_LEN,
3959 0, NULL, (u8 *)&checksum);
3961 if (digest != checksum) {
3962 pr_err("HeaderDigest CRC32C failed,"
3963 " received 0x%08x, computed 0x%08x\n",
3966 * Set the PDU to 0xff so it will intentionally
3967 * hit default in the switch below.
3969 memset(buffer, 0xff, ISCSI_HDR_LEN);
3970 atomic_long_inc(&conn->sess->conn_digest_errors);
3972 pr_debug("Got HeaderDigest CRC32C"
3973 " 0x%08x\n", checksum);
3977 if (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT)
3980 opcode = buffer[0] & ISCSI_OPCODE_MASK;
3982 if (conn->sess->sess_ops->SessionType &&
3983 ((!(opcode & ISCSI_OP_TEXT)) ||
3984 (!(opcode & ISCSI_OP_LOGOUT)))) {
3985 pr_err("Received illegal iSCSI Opcode: 0x%02x"
3986 " while in Discovery Session, rejecting.\n", opcode);
3987 iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
3992 ret = iscsi_target_rx_opcode(conn, buffer);
3998 int iscsi_target_rx_thread(void *arg)
4001 struct iscsi_conn *conn = arg;
4004 * Allow ourselves to be interrupted by SIGINT so that a
4005 * connection recovery / failure event can be triggered externally.
4007 allow_signal(SIGINT);
4009 * Wait for iscsi_post_login_handler() to complete before allowing
4010 * incoming iscsi/tcp socket I/O, and/or failing the connection.
4012 rc = wait_for_completion_interruptible(&conn->rx_login_comp);
4013 if (rc < 0 || iscsi_target_check_conn_state(conn))
4016 if (!conn->conn_transport->iscsit_get_rx_pdu)
4019 conn->conn_transport->iscsit_get_rx_pdu(conn);
4021 if (!signal_pending(current))
4022 atomic_set(&conn->transport_failed, 1);
4023 iscsit_take_action_for_connection_exit(conn);
4027 static void iscsit_release_commands_from_conn(struct iscsi_conn *conn)
4029 struct iscsi_cmd *cmd = NULL, *cmd_tmp = NULL;
4030 struct iscsi_session *sess = conn->sess;
4032 * We expect this function to only ever be called from either RX or TX
4033 * thread context via iscsit_close_connection() once the other context
4034 * has been reset -> returned sleeping pre-handler state.
4036 spin_lock_bh(&conn->cmd_lock);
4037 list_for_each_entry_safe(cmd, cmd_tmp, &conn->conn_cmd_list, i_conn_node) {
4039 list_del_init(&cmd->i_conn_node);
4040 spin_unlock_bh(&conn->cmd_lock);
4042 iscsit_increment_maxcmdsn(cmd, sess);
4044 iscsit_free_cmd(cmd, true);
4046 spin_lock_bh(&conn->cmd_lock);
4048 spin_unlock_bh(&conn->cmd_lock);
4051 static void iscsit_stop_timers_for_cmds(
4052 struct iscsi_conn *conn)
4054 struct iscsi_cmd *cmd;
4056 spin_lock_bh(&conn->cmd_lock);
4057 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
4058 if (cmd->data_direction == DMA_TO_DEVICE)
4059 iscsit_stop_dataout_timer(cmd);
4061 spin_unlock_bh(&conn->cmd_lock);
4064 int iscsit_close_connection(
4065 struct iscsi_conn *conn)
4067 int conn_logout = (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT);
4068 struct iscsi_session *sess = conn->sess;
4070 pr_debug("Closing iSCSI connection CID %hu on SID:"
4071 " %u\n", conn->cid, sess->sid);
4073 * Always up conn_logout_comp for the traditional TCP and HW_OFFLOAD
4074 * case just in case the RX Thread in iscsi_target_rx_opcode() is
4075 * sleeping and the logout response never got sent because the
4076 * connection failed.
4078 * However for iser-target, isert_wait4logout() is using conn_logout_comp
4079 * to signal logout response TX interrupt completion. Go ahead and skip
4080 * this for iser since isert_rx_opcode() does not wait on logout failure,
4081 * and to avoid iscsi_conn pointer dereference in iser-target code.
4083 if ((conn->conn_transport->transport_type == ISCSI_TCP) ||
4084 (conn->conn_transport->transport_type == ISCSI_HW_OFFLOAD))
4085 complete(&conn->conn_logout_comp);
4087 if (!strcmp(current->comm, ISCSI_RX_THREAD_NAME)) {
4088 if (conn->tx_thread &&
4089 cmpxchg(&conn->tx_thread_active, true, false)) {
4090 send_sig(SIGINT, conn->tx_thread, 1);
4091 kthread_stop(conn->tx_thread);
4093 } else if (!strcmp(current->comm, ISCSI_TX_THREAD_NAME)) {
4094 if (conn->rx_thread &&
4095 cmpxchg(&conn->rx_thread_active, true, false)) {
4096 send_sig(SIGINT, conn->rx_thread, 1);
4097 kthread_stop(conn->rx_thread);
4101 spin_lock(&iscsit_global->ts_bitmap_lock);
4102 bitmap_release_region(iscsit_global->ts_bitmap, conn->bitmap_id,
4104 spin_unlock(&iscsit_global->ts_bitmap_lock);
4106 iscsit_stop_timers_for_cmds(conn);
4107 iscsit_stop_nopin_response_timer(conn);
4108 iscsit_stop_nopin_timer(conn);
4110 if (conn->conn_transport->iscsit_wait_conn)
4111 conn->conn_transport->iscsit_wait_conn(conn);
4114 * During Connection recovery drop unacknowledged out of order
4115 * commands for this connection, and prepare the other commands
4118 * During normal operation clear the out of order commands (but
4119 * do not free the struct iscsi_ooo_cmdsn's) and release all
4120 * struct iscsi_cmds.
4122 if (atomic_read(&conn->connection_recovery)) {
4123 iscsit_discard_unacknowledged_ooo_cmdsns_for_conn(conn);
4124 iscsit_prepare_cmds_for_realligance(conn);
4126 iscsit_clear_ooo_cmdsns_for_conn(conn);
4127 iscsit_release_commands_from_conn(conn);
4129 iscsit_free_queue_reqs_for_conn(conn);
4132 * Handle decrementing session or connection usage count if
4133 * a logout response was not able to be sent because the
4134 * connection failed. Fall back to Session Recovery here.
4136 if (atomic_read(&conn->conn_logout_remove)) {
4137 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_SESSION) {
4138 iscsit_dec_conn_usage_count(conn);
4139 iscsit_dec_session_usage_count(sess);
4141 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION)
4142 iscsit_dec_conn_usage_count(conn);
4144 atomic_set(&conn->conn_logout_remove, 0);
4145 atomic_set(&sess->session_reinstatement, 0);
4146 atomic_set(&sess->session_fall_back_to_erl0, 1);
4149 spin_lock_bh(&sess->conn_lock);
4150 list_del(&conn->conn_list);
4153 * Attempt to let the Initiator know this connection failed by
4154 * sending an Connection Dropped Async Message on another
4155 * active connection.
4157 if (atomic_read(&conn->connection_recovery))
4158 iscsit_build_conn_drop_async_message(conn);
4160 spin_unlock_bh(&sess->conn_lock);
4163 * If connection reinstatement is being performed on this connection,
4164 * up the connection reinstatement semaphore that is being blocked on
4165 * in iscsit_cause_connection_reinstatement().
4167 spin_lock_bh(&conn->state_lock);
4168 if (atomic_read(&conn->sleep_on_conn_wait_comp)) {
4169 spin_unlock_bh(&conn->state_lock);
4170 complete(&conn->conn_wait_comp);
4171 wait_for_completion(&conn->conn_post_wait_comp);
4172 spin_lock_bh(&conn->state_lock);
4176 * If connection reinstatement is being performed on this connection
4177 * by receiving a REMOVECONNFORRECOVERY logout request, up the
4178 * connection wait rcfr semaphore that is being blocked on
4179 * an iscsit_connection_reinstatement_rcfr().
4181 if (atomic_read(&conn->connection_wait_rcfr)) {
4182 spin_unlock_bh(&conn->state_lock);
4183 complete(&conn->conn_wait_rcfr_comp);
4184 wait_for_completion(&conn->conn_post_wait_comp);
4185 spin_lock_bh(&conn->state_lock);
4187 atomic_set(&conn->connection_reinstatement, 1);
4188 spin_unlock_bh(&conn->state_lock);
4191 * If any other processes are accessing this connection pointer we
4192 * must wait until they have completed.
4194 iscsit_check_conn_usage_count(conn);
4196 ahash_request_free(conn->conn_tx_hash);
4197 if (conn->conn_rx_hash) {
4198 struct crypto_ahash *tfm;
4200 tfm = crypto_ahash_reqtfm(conn->conn_rx_hash);
4201 ahash_request_free(conn->conn_rx_hash);
4202 crypto_free_ahash(tfm);
4205 free_cpumask_var(conn->conn_cpumask);
4207 kfree(conn->conn_ops);
4208 conn->conn_ops = NULL;
4211 sock_release(conn->sock);
4213 if (conn->conn_transport->iscsit_free_conn)
4214 conn->conn_transport->iscsit_free_conn(conn);
4216 iscsit_put_transport(conn->conn_transport);
4218 pr_debug("Moving to TARG_CONN_STATE_FREE.\n");
4219 conn->conn_state = TARG_CONN_STATE_FREE;
4222 spin_lock_bh(&sess->conn_lock);
4223 atomic_dec(&sess->nconn);
4224 pr_debug("Decremented iSCSI connection count to %hu from node:"
4225 " %s\n", atomic_read(&sess->nconn),
4226 sess->sess_ops->InitiatorName);
4228 * Make sure that if one connection fails in an non ERL=2 iSCSI
4229 * Session that they all fail.
4231 if ((sess->sess_ops->ErrorRecoveryLevel != 2) && !conn_logout &&
4232 !atomic_read(&sess->session_logout))
4233 atomic_set(&sess->session_fall_back_to_erl0, 1);
4236 * If this was not the last connection in the session, and we are
4237 * performing session reinstatement or falling back to ERL=0, call
4238 * iscsit_stop_session() without sleeping to shutdown the other
4239 * active connections.
4241 if (atomic_read(&sess->nconn)) {
4242 if (!atomic_read(&sess->session_reinstatement) &&
4243 !atomic_read(&sess->session_fall_back_to_erl0)) {
4244 spin_unlock_bh(&sess->conn_lock);
4247 if (!atomic_read(&sess->session_stop_active)) {
4248 atomic_set(&sess->session_stop_active, 1);
4249 spin_unlock_bh(&sess->conn_lock);
4250 iscsit_stop_session(sess, 0, 0);
4253 spin_unlock_bh(&sess->conn_lock);
4258 * If this was the last connection in the session and one of the
4259 * following is occurring:
4261 * Session Reinstatement is not being performed, and are falling back
4262 * to ERL=0 call iscsit_close_session().
4264 * Session Logout was requested. iscsit_close_session() will be called
4267 * Session Continuation is not being performed, start the Time2Retain
4268 * handler and check if sleep_on_sess_wait_sem is active.
4270 if (!atomic_read(&sess->session_reinstatement) &&
4271 atomic_read(&sess->session_fall_back_to_erl0)) {
4272 spin_unlock_bh(&sess->conn_lock);
4273 target_put_session(sess->se_sess);
4276 } else if (atomic_read(&sess->session_logout)) {
4277 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4278 sess->session_state = TARG_SESS_STATE_FREE;
4279 spin_unlock_bh(&sess->conn_lock);
4281 if (atomic_read(&sess->sleep_on_sess_wait_comp))
4282 complete(&sess->session_wait_comp);
4286 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4287 sess->session_state = TARG_SESS_STATE_FAILED;
4289 if (!atomic_read(&sess->session_continuation)) {
4290 spin_unlock_bh(&sess->conn_lock);
4291 iscsit_start_time2retain_handler(sess);
4293 spin_unlock_bh(&sess->conn_lock);
4295 if (atomic_read(&sess->sleep_on_sess_wait_comp))
4296 complete(&sess->session_wait_comp);
4302 int iscsit_close_session(struct iscsi_session *sess)
4304 struct iscsi_portal_group *tpg = sess->tpg;
4305 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4307 if (atomic_read(&sess->nconn)) {
4308 pr_err("%d connection(s) still exist for iSCSI session"
4309 " to %s\n", atomic_read(&sess->nconn),
4310 sess->sess_ops->InitiatorName);
4314 spin_lock_bh(&se_tpg->session_lock);
4315 atomic_set(&sess->session_logout, 1);
4316 atomic_set(&sess->session_reinstatement, 1);
4317 iscsit_stop_time2retain_timer(sess);
4318 spin_unlock_bh(&se_tpg->session_lock);
4321 * transport_deregister_session_configfs() will clear the
4322 * struct se_node_acl->nacl_sess pointer now as a iscsi_np process context
4323 * can be setting it again with __transport_register_session() in
4324 * iscsi_post_login_handler() again after the iscsit_stop_session()
4325 * completes in iscsi_np context.
4327 transport_deregister_session_configfs(sess->se_sess);
4330 * If any other processes are accessing this session pointer we must
4331 * wait until they have completed. If we are in an interrupt (the
4332 * time2retain handler) and contain and active session usage count we
4333 * restart the timer and exit.
4335 if (!in_interrupt()) {
4336 if (iscsit_check_session_usage_count(sess) == 1)
4337 iscsit_stop_session(sess, 1, 1);
4339 if (iscsit_check_session_usage_count(sess) == 2) {
4340 atomic_set(&sess->session_logout, 0);
4341 iscsit_start_time2retain_handler(sess);
4346 transport_deregister_session(sess->se_sess);
4348 if (sess->sess_ops->ErrorRecoveryLevel == 2)
4349 iscsit_free_connection_recovery_entires(sess);
4351 iscsit_free_all_ooo_cmdsns(sess);
4353 spin_lock_bh(&se_tpg->session_lock);
4354 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4355 sess->session_state = TARG_SESS_STATE_FREE;
4356 pr_debug("Released iSCSI session from node: %s\n",
4357 sess->sess_ops->InitiatorName);
4360 tpg->tpg_tiqn->tiqn_nsessions--;
4362 pr_debug("Decremented number of active iSCSI Sessions on"
4363 " iSCSI TPG: %hu to %u\n", tpg->tpgt, tpg->nsessions);
4365 spin_lock(&sess_idr_lock);
4366 idr_remove(&sess_idr, sess->session_index);
4367 spin_unlock(&sess_idr_lock);
4369 kfree(sess->sess_ops);
4370 sess->sess_ops = NULL;
4371 spin_unlock_bh(&se_tpg->session_lock);
4377 static void iscsit_logout_post_handler_closesession(
4378 struct iscsi_conn *conn)
4380 struct iscsi_session *sess = conn->sess;
4383 * Traditional iscsi/tcp will invoke this logic from TX thread
4384 * context during session logout, so clear tx_thread_active and
4385 * sleep if iscsit_close_connection() has not already occured.
4387 * Since iser-target invokes this logic from it's own workqueue,
4388 * always sleep waiting for RX/TX thread shutdown to complete
4389 * within iscsit_close_connection().
4391 if ((conn->conn_transport->transport_type == ISCSI_TCP) ||
4392 (conn->conn_transport->transport_type == ISCSI_HW_OFFLOAD))
4393 sleep = cmpxchg(&conn->tx_thread_active, true, false);
4395 atomic_set(&conn->conn_logout_remove, 0);
4396 complete(&conn->conn_logout_comp);
4398 iscsit_dec_conn_usage_count(conn);
4399 iscsit_stop_session(sess, sleep, sleep);
4400 iscsit_dec_session_usage_count(sess);
4401 target_put_session(sess->se_sess);
4404 static void iscsit_logout_post_handler_samecid(
4405 struct iscsi_conn *conn)
4409 if ((conn->conn_transport->transport_type == ISCSI_TCP) ||
4410 (conn->conn_transport->transport_type == ISCSI_HW_OFFLOAD))
4411 sleep = cmpxchg(&conn->tx_thread_active, true, false);
4413 atomic_set(&conn->conn_logout_remove, 0);
4414 complete(&conn->conn_logout_comp);
4416 iscsit_cause_connection_reinstatement(conn, sleep);
4417 iscsit_dec_conn_usage_count(conn);
4420 static void iscsit_logout_post_handler_diffcid(
4421 struct iscsi_conn *conn,
4424 struct iscsi_conn *l_conn;
4425 struct iscsi_session *sess = conn->sess;
4426 bool conn_found = false;
4431 spin_lock_bh(&sess->conn_lock);
4432 list_for_each_entry(l_conn, &sess->sess_conn_list, conn_list) {
4433 if (l_conn->cid == cid) {
4434 iscsit_inc_conn_usage_count(l_conn);
4439 spin_unlock_bh(&sess->conn_lock);
4445 l_conn->sock->ops->shutdown(l_conn->sock, RCV_SHUTDOWN);
4447 spin_lock_bh(&l_conn->state_lock);
4448 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
4449 l_conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
4450 spin_unlock_bh(&l_conn->state_lock);
4452 iscsit_cause_connection_reinstatement(l_conn, 1);
4453 iscsit_dec_conn_usage_count(l_conn);
4457 * Return of 0 causes the TX thread to restart.
4459 int iscsit_logout_post_handler(
4460 struct iscsi_cmd *cmd,
4461 struct iscsi_conn *conn)
4465 switch (cmd->logout_reason) {
4466 case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
4467 switch (cmd->logout_response) {
4468 case ISCSI_LOGOUT_SUCCESS:
4469 case ISCSI_LOGOUT_CLEANUP_FAILED:
4471 iscsit_logout_post_handler_closesession(conn);
4476 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
4477 if (conn->cid == cmd->logout_cid) {
4478 switch (cmd->logout_response) {
4479 case ISCSI_LOGOUT_SUCCESS:
4480 case ISCSI_LOGOUT_CLEANUP_FAILED:
4482 iscsit_logout_post_handler_samecid(conn);
4487 switch (cmd->logout_response) {
4488 case ISCSI_LOGOUT_SUCCESS:
4489 iscsit_logout_post_handler_diffcid(conn,
4492 case ISCSI_LOGOUT_CID_NOT_FOUND:
4493 case ISCSI_LOGOUT_CLEANUP_FAILED:
4500 case ISCSI_LOGOUT_REASON_RECOVERY:
4501 switch (cmd->logout_response) {
4502 case ISCSI_LOGOUT_SUCCESS:
4503 case ISCSI_LOGOUT_CID_NOT_FOUND:
4504 case ISCSI_LOGOUT_RECOVERY_UNSUPPORTED:
4505 case ISCSI_LOGOUT_CLEANUP_FAILED:
4517 EXPORT_SYMBOL(iscsit_logout_post_handler);
4519 void iscsit_fail_session(struct iscsi_session *sess)
4521 struct iscsi_conn *conn;
4523 spin_lock_bh(&sess->conn_lock);
4524 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) {
4525 pr_debug("Moving to TARG_CONN_STATE_CLEANUP_WAIT.\n");
4526 conn->conn_state = TARG_CONN_STATE_CLEANUP_WAIT;
4528 spin_unlock_bh(&sess->conn_lock);
4530 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4531 sess->session_state = TARG_SESS_STATE_FAILED;
4534 int iscsit_free_session(struct iscsi_session *sess)
4536 u16 conn_count = atomic_read(&sess->nconn);
4537 struct iscsi_conn *conn, *conn_tmp = NULL;
4540 spin_lock_bh(&sess->conn_lock);
4541 atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4543 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4545 if (conn_count == 0)
4548 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4551 iscsit_inc_conn_usage_count(conn_tmp);
4554 iscsit_inc_conn_usage_count(conn);
4556 spin_unlock_bh(&sess->conn_lock);
4557 iscsit_cause_connection_reinstatement(conn, 1);
4558 spin_lock_bh(&sess->conn_lock);
4560 iscsit_dec_conn_usage_count(conn);
4562 iscsit_dec_conn_usage_count(conn_tmp);
4567 if (atomic_read(&sess->nconn)) {
4568 spin_unlock_bh(&sess->conn_lock);
4569 wait_for_completion(&sess->session_wait_comp);
4571 spin_unlock_bh(&sess->conn_lock);
4573 target_put_session(sess->se_sess);
4577 void iscsit_stop_session(
4578 struct iscsi_session *sess,
4580 int connection_sleep)
4582 u16 conn_count = atomic_read(&sess->nconn);
4583 struct iscsi_conn *conn, *conn_tmp = NULL;
4586 spin_lock_bh(&sess->conn_lock);
4588 atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4590 if (connection_sleep) {
4591 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4593 if (conn_count == 0)
4596 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4599 iscsit_inc_conn_usage_count(conn_tmp);
4602 iscsit_inc_conn_usage_count(conn);
4604 spin_unlock_bh(&sess->conn_lock);
4605 iscsit_cause_connection_reinstatement(conn, 1);
4606 spin_lock_bh(&sess->conn_lock);
4608 iscsit_dec_conn_usage_count(conn);
4610 iscsit_dec_conn_usage_count(conn_tmp);
4614 list_for_each_entry(conn, &sess->sess_conn_list, conn_list)
4615 iscsit_cause_connection_reinstatement(conn, 0);
4618 if (session_sleep && atomic_read(&sess->nconn)) {
4619 spin_unlock_bh(&sess->conn_lock);
4620 wait_for_completion(&sess->session_wait_comp);
4622 spin_unlock_bh(&sess->conn_lock);
4625 int iscsit_release_sessions_for_tpg(struct iscsi_portal_group *tpg, int force)
4627 struct iscsi_session *sess;
4628 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4629 struct se_session *se_sess, *se_sess_tmp;
4630 LIST_HEAD(free_list);
4631 int session_count = 0;
4633 spin_lock_bh(&se_tpg->session_lock);
4634 if (tpg->nsessions && !force) {
4635 spin_unlock_bh(&se_tpg->session_lock);
4639 list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list,
4641 sess = (struct iscsi_session *)se_sess->fabric_sess_ptr;
4643 spin_lock(&sess->conn_lock);
4644 if (atomic_read(&sess->session_fall_back_to_erl0) ||
4645 atomic_read(&sess->session_logout) ||
4646 (sess->time2retain_timer_flags & ISCSI_TF_EXPIRED)) {
4647 spin_unlock(&sess->conn_lock);
4650 atomic_set(&sess->session_reinstatement, 1);
4651 spin_unlock(&sess->conn_lock);
4653 list_move_tail(&se_sess->sess_list, &free_list);
4655 spin_unlock_bh(&se_tpg->session_lock);
4657 list_for_each_entry_safe(se_sess, se_sess_tmp, &free_list, sess_list) {
4658 sess = (struct iscsi_session *)se_sess->fabric_sess_ptr;
4660 iscsit_free_session(sess);
4664 pr_debug("Released %d iSCSI Session(s) from Target Portal"
4665 " Group: %hu\n", session_count, tpg->tpgt);
4669 MODULE_DESCRIPTION("iSCSI-Target Driver for mainline target infrastructure");
4670 MODULE_VERSION("4.1.x");
4671 MODULE_AUTHOR("nab@Linux-iSCSI.org");
4672 MODULE_LICENSE("GPL");
4674 module_init(iscsi_target_init_module);
4675 module_exit(iscsi_target_cleanup_module);